Another Strike Against The 300 Blackout

Our regulars know that, at least for the foreseeable future, we want nothing to do with the 300 Blackout cartridge. Yes, I am aware that it is the flavor of the day. Yes, I am aware that it’s optimal for suppression. Yes, I am aware many say it preforms like a 7.62×39 but in a AR.

Sure. Sure. Which is all good. But none of those things are mutually exclusive to the 300. And on principle, I am not opposed to switch caliber weapons. I run both a Blaser R8 and a Blaser Tactical 2 rifle. Combined, I believe there are over 40 calibers available between them.

But one of the selling points of the 300 Blackout is one of it’s drawbacks. The standard AR bolt and magazine work for both calibers. At least on the Blaser system, you have barrels, bolts and magazines that all need to make sense. And there is a clever way that Blaser presents the markings for all three parts in one field of view.

On the AR, it is very, very, very easy to simply pickup the wrong ammo and fire it in the wrong gun. With catastrophic results. Yes, I understand it’s a training issue. Yes, I understand it’s a user error, not a design flaw.

But 300 Blackout doesn’t do anything for me that standard calibers don’t. So I choose to not mess with it. Just in the last 15 or so years, I have seen 357SIG, 10mm, 45GAP and 6.8SPC statistically die. With what appears to be 40S&W shuffled off to Hospice Care. And I’m skipping over more calibers that in reality never got out of the wildcat stage.

300blk has a long, long, long way to go before I let even one single, solitary round into the arsenal.

“Shooting Guns & Having Fun”

Marky Mark

Marky Mark

Writer at
Writer for Co-Host of the John1911 Podcast. Video content provider for John1911-TV.

Areas of focus: Defense and National Security, Modern Light Weapons, Analysis of the Geo-political / Military Relationship in the Context of Strategic Goals.
Marky Mark

Latest posts by Marky Mark (see all)

  • Chris Bergen

    Yikes… What’s the story? A 300 blackout in a 5.56 barrel or vice versa? My 300 BLK OUT is well marked AND is a different length than my 5.56 (10.5 vs 16), so hopefully it will be obvious enough. But the lesson is well considered…

    • 300 in a 556. Hence the massive damage. It’s something the 300 guys, who run a conversion, need to at least be made aware of.

      The biggest offender is the guy who shows up at the range with both. And then has friends with him as well.

      Both calibers on site. People are talking. Possibly shooting each other’s guns.

      Accidents happen.


      • Chris Bergen

        Out of curiosity, I tried to load a 300 blkout into my 5.56 rifle… The bcg would NOT go into battery, which of course means it won’t fire… I suspect something else may have happened here…. Now a 5.56 will certainly feed into a 300 BLK chamber…

        • Chris Bergen

          You can see the scratches from the lands on the bullet…

          • Look deeper into the subject.


          • Chris Bergen

            Apparently if I had allowed the bolt to go forward with full power it would have pushed the bullet into the case (setback), allowing the bolt to go into battery and let the hammer hit the firing pin. While it’s certainly possible, that’s a whole lotta things to go wrong… Hopefully I won’t be sending you a pic of mine!

          • Correct.


      • right_on

        How did the bolt even close? 😳

        • Jim

          repeated blows to the forward assist with a mallet.

          • right_on


        • Known issue. 300Blk loads vary greatly by bullet weight alone.


  • Disappointed

    Wtf did I just read? By your argument if I had identical looking .223, .243, and .308 Rem 700 rifles then I would blow them all up because I’m not smart enough to understand which is what.

    If you truly believe this is a downfall then you really need to educate yourself on firearms. Between you and Wayner at TTAG I am now dinner for reading articles on the Internet.

    • Tony Filipeli

      I got out of it….a personal opinion to the “look” of similar pieces and the user failing to identify prior to firing the weapon. More about user error versus weapon error.

      • Which is fair. As long as the owner, and everyone around him, are aware of the issue we are all better for it.


    • I don’t know who Wayner or TeeTag is, so please tell him I said hello.


      • Mikial

        TeeTag is the snarkiest forum of internet gun ‘experts’ you’ll ever have the dubious entertainment experience of reading.

        • Well, it’s a forum so that explains a lot. Forums are good for “some” pieces of data but tend to be way too political and drama oriented. I like to spend my time outside. I realize I am in the minority though. –Marky

  • charles robb

    Blazer R8 is not immune to operator failure. I have a customer who’s missing 1/2 his face due to a Blazer R 8 failure!💀💀💀💀💀💀💀💀💀💀💀💀💀💀

    • I agree. No it is not. Caliber conversions for any gun introduces new issues. And we need to educate the user before he blows a body part off.

      Send me the Blaser R8 info. I would like to see it and post an article about it. E-mail is fine if you prefer and I can blur and hide identities.


  • JphilB

    This is NOT a reason to stay away from buying a 300 Blackout. This is like not buying a diesel truck because you are afraid you will put gasoline in it and wreck the engine. “Another Strike Against Diesel!!”

    • That is a GREAT point actually!!!!

      Just like with diesel vehicles in the US, you need to tell the average buyer that he or she will need to pay closer attention to the gas pumps. And explain that you may pull up some pumps and find no gas available for you.

      Also if you let someone borrow your car, or have them fill the tank while you hit the head, make sure they are aware they can’t grab premium 99 and put it in your six figure European car.

      Man! That is actually EXACTLY the point. Thank you.


      • Faded Joke

        I’ve got mine, thought about pros and cons for a while. The way I see it is you prep for the round like any other, at least 2 full 30cal cans loose, if you run out there will be plenty of dropped weapons to pull an upper off of.

        • Props for a new and interesting point that I have never heard before. All you need to do is swap an upper if you are running an AR.

          In America we live in a 5.56 / AR universe. Finding some kind of AR in a pinch isn’t like making a moon shoot.

          Not a fan of 300, but I have to give solid props for your point.


    • Lincoln Pope

      I need to learn to read other posts before I comment.

  • TheRealHorridus

    I personally think you are missing out…….

    [[overly long fanboy essay white knighting the .300blk REDACTED]]

    ……..Don’t blame a caliber for someone not paying attention 🙂

    Love your shirts!

    • Look, like the rest of you I live in the real world. I would love to shoot every caliber of every gun ever made. But in the real world, I am limited by logistics and money. I like to shoot quite a bit. If I ever did run 300blk, it would have to be more as a precision rifle. If money was of no concern, maybe I would be of a different mind. But I recall some years ago running into a well known gun-mag professional who was running 6.8. It was the greatest thing since sliced bread. And he has the inside dope that the SF guys were going to pick it up. In the end, he fired I think over 1000 rounds of 6.8 at $1 or $3 a shot! And Big Army never came calling.


      • DChrls

        300 Blackout isn’t what I would consider a precision round; not that I’m some expert on the subject.
        If you want to shoot precision long distance in an AR15 and use off the shelf/commercially available ammo look at .223 or better yet 6.5 Grendel. If you reload there are more rounds available for the AR15 that are accurate at long distances.

        • Guess I should explain. I know a civilian SWAT sniper who bought a 300blk bolt gun. His argument was for urban deer deprivation. But when he went out to use it at even moderate distances…they had all kinds of trouble.

          I guess I should have specified “bolt” as opposed to automatic. 30 rounds of 300blk adds up quick on the expense report.


  • Daniel, God is my judge

    Man, I am so old school. My SHTF rifles are 5.56 ARs, 7.62×39 AKs and an LAR8 308. No way are you going to interchange ammo or magazines. BUT THEN, I got to thinking about whether the Colt 1911 9 mm magazine would fit into the Kimber 45 auto, both are officer models, 7 rounds. Surprise, it will and when the slide goes into battery it even picks up a 9mm round. But, I laughed my a.. off when I tilted the gun down and the 9mm round slid out the end of the barrel, guess that ain’t gonna go bang. I still believe in the KISS principle. Thanks for the insight Marky.

    • It’s the Walmart principle for me. In MSR / Tac Rifles, I look at even 7.62×39 as a non-standard caliber. Why? I live in the United States! 300Blk? In a MSR that I use like a MSR? Pass.


      • Mikial

        Have to agree with you here. Yes, we do have an AK 7.62X39 rifle because . . . well, because we wanted one. And we have a Mosin in 7.62X54r, because I wanted one. We have ammo for both and enjoy them. But for SHTF items we stick to common US calibers like 5.56/.223, 30-06, .308 and the common pistol and revolver rounds like 9mm, .45ACP, and .357. Of course, 22LR is always included. I tend to shy away from anything I consider ‘exotic’ because I don’t want to have to worry about ammo availability.

  • Thomas Jeffer

    Well I can’t say one way or another on this topic right now, I like the 223/556 case and enjoy the ar platform so I said to hell with it and I bought a 16″stoner barrel in .300 blackout cause I had some extra parts including an upper and lower so I spent the $89 from midway and ordered it and a set of dies just to please my curiosity, still haven’t bought a BCG yet but I will.

    so far from what I can tell its a lot of prep work getting brass ready if your converting the 556 down to it and 556 is already a pain in the ass to load after swaging and trimming blah blah blah, but fuck it I’m anxious to see what the thing will do with a can on it, BUT i joined a .300 blk page on Facebook just to see if I could find some load advice ya know and ask some questions and what I find is these guys act like this cartridge is gods gift to human beings and right there I was just dumb struck to hear some of these guys pushing bullshit of how the blk out round is harder hitting than a .30-30 and it’s better than the Russian round and how if they were going to buy a bolt gun it would be blackout over other cartridges, instantly I call bullshit to these guys and pretty much call them out on almost everything and tell them that in my book the only Beautiful thing of it is to me is that it takes the AR mags and the bolt as well and it’s a caliber I can hunt with in my state not that it’s the rifle I’m gonna grab to go tag a buck but if I wanted to I could, but it’s not that crazy of a round.

    these guys acted like I just kicked there dog right in front of them hahaha whatever, I like the idea of the round but I completely understand your stance on it about not adding another cartridge to buy and stock up on it cause it’s expensive BUT I do have to say that just because it’s a different oddball cartridge don’t let that detour you on guns,some of my most favorite guns to shoot are oddball/old calibers such as the .32-20, love the hell out of that round I don’t shoot it even an 1/16 as much as any of my other guns, it’s expensive and not easy to find the rounds but I like it, a lot of guys could talk shit about how a 9mm is harder hitting and all it’s a better round but I really don’t care I like it,

    the .300 blackout would not be my go to/ shtf rifle. but in my book every gun is worth owning even if you don’t shoot it as much as other guns.

    I really enjoy the podcast guys, keep up the good work

    • You probably get the award for the best comment of the thread and one of the best ever posted on the site. You have the right attitude for 300blk. It does do some stuff good, but for most of how I run a AR/MSR style rifle, 300 is just pissing money away.

      It’s like 10mm. I like it. It has it’s place. But I recall having a 10mm conversation with a retired US Marshall friend of mine and some of this thinking and logic was coo-coo.

      I call it bias. And when you realize that most American gun owners have their ego wrapped up in their gun purchases, it gets personal real quick. And when things get personal, the bullshit meter gets turned up to 11.


  • StraightShot

    You are saying that this was caused when a shooter chambered (partially) a .300blk in a 5.56mm rifle?
    If that is what happened I need to wonder how the got the rifle to fire as the 7.62mm diameter bullet should not fit far enough into a proper chamber to allow the bolt to close unless the cartridge wasn’t properly crimped in place.
    There appears to be another problem as the hammer shouldn’t drop if the bolt wasn’t closed.

    • You would think that. But 300 is based off the 223 case. Depending on the bullet and powder load, it can setback and chamber. Looking at the damage, it is obvious the bullet didn’t move too far down the 223 barrel. Instead it blew the upper apart.

      Freeze was telling me of a case where the 300blk actually went pretty far down a barrel but was squeezed and elongated to 22 caliber.


      • 1918A3BAR

        When I seen this picture I instantly thought someone grabbed the blackout round (probably a handload) stacked it in the magazine loaded the rifle and dropped the bolt home and probably didn’t have a crimp on it the case and it pushed the bullet into the case far enough for the bolt to go into battery and kaboom

  • Lincoln Pope

    So………the problem with the RIFLE is that it’s too easy to put the wrong ammo in it? Sounds to me that it’s a USER error. If you put regular gas in a diesel, who’s fault is that?

    • Fair point. As long as you factor in the cost, time, and logistics of the mistakes which statistically WILL happen.

      Just like the paramedics who put regular gas in their diesel ambulances.

      Every. Single. Year.


  • Bob Harris

    So, in other words, if you are a moron, you should avoid the 300BO. Otherwise, if you use some basic common sense, the caliber is perfectly OK. Gotcha.

    • Bob, the truth is humans are fallible. Nothing we do or say will eliminate that completely. All we can do is educate people so they can be aware of the potential pitfalls. This gives them the tools to help negotiate these pain points.

      I recall when this kind of stuff first came up and the consensus was, by people who it appears actually didn’t know the answer, this was mechanically impossible.

      Now at least the community is aware.


  • Scott Ladrochelle

    You wrote “But 300 Blackout doesn’t do anything for me that standard calibers don’t.” The 300 Blackout penetrates light to heavy cover and it is not as easily deflected. My experience during the war was that the 5.56 mm was easily deflected by light foliage and the enemy knew that, their AK rounds did not have that issue. Where I live there are creosote and mesquite among the tall grass and thistle, you can see though the foliage at spots but I can’t reliably hit a target behind that growth with a 42 round magazine of 5.56mm. I have no problems hitting the same target with either the .300 Blackout or the 7.62 X 39mm. We won’t even begin talk about stopping power or getting water in the bore.

    • Point 1:
      7.62×39 = the original 300 blackout.

      Point 2:
      You can achieve the performance you mention above, for the situation as you describe, with 7.62×51.

      Point 3:
      You can achieve that suppressed with subsonic 308 ammo.

      Point 4:
      You can buy a myriad of 308 rifles with 20-30 round mags if you need that many rounds suppressed. Again….not just that many rounds. That many rounds suppressed.

      Point 5:
      There is really only one thing 300blk does somewhat better than all the examples I give above. That is replace the HK MP-5SD with a AR pattern of rifle, for high-volume, EXTREMELY QUIET suppressed fire, at room clearing distances.

      Point 6:
      Of everyone of us who has cleared a room for real, it is a very, very, very, very, very, very, very, very, very, very small subset that needs to do that uber-suppressed, with high-volume fire, in order to not die.

      Now back to reality: this blog is for civilians. Who have to buy their own rifles and pay for their own ammunition and maybe…just maybe…pay for a little bit of training.

      If you can make the math work for you, carry on.

      If 300blk is the one thing that floats your boat and gets you pulling the trigger, carry on.

      If SOCOM is buying you pallets and pallets of 300blk, carry on.

      But logistically, the juice isn’t worth the squeeze in the non-SF, civilian world.


      • Scott Ladrochelle

        Oh absolutely, the .308 (7.62mm NATO) is a FAR superior cartridge! The 7.62 X 39mm AK a superior battle implement. My FAL does not suppress as successfully and the C308 (H&K Design) is a disaster at getting reliable performance when suppressed with subsonics. Their ergonomics make indoor use problematic. My .300 Blackout (and the .300 Whisper before it) has tons of users and builders with actual experience running subsonic suppressed in the compact M4 platform and their research and experience is golden! And the suppressed .300’s are very easy to deploy and their ease in switching from Subsonic to Supersonic is to be envied.
        Just remember in boot camp they issued us an M14 in 7.62mm NATO and we had to qualify at 500 and 800 yards. During the war they issued us the early M16, and maximum qualification range was dropped to 300 yards back then. I was NOT a fan and it’s shortcomings were deadly. If you are in love with the little guy, I am happy for you!
        I whole heartedly agree with your assessment recommending the 7.62mm X 39 AK’s and the 7.62mm NATO Battle rifles!
        In all the new AR’s are wonderfully Modular and calibers run the gamut from .22LR to .500 Beowulf.
        (.300’s need to be separated their magazines taped so identification (even in the dark) is easy and safety safety safety their new religion. Their reward is great though!
        And may you 22 bore guys not come under fire from light cover!)
        The government adopted the 5.56mm under the guise that it was better to wound an enemy, I felt somewhat better with a resounding stop.

        • That crack about 223 right at the end is where your logic consistently falls apart.

          300blk doesn’t make 223 bad.

          308 doesn’t make 223 bad.

          7.62×39 doesn’t make 223 bad.

          It’s not a zero sum game. I saw a video just yesterday where a full-sized 7.62x54R battle round didn’t get a one stop shot on a human with a frontal-face / head-shot.

          Shoot what you want. I just personally don’t have a need to dump 30 rounds fully suppressed, at room distances, into a human. Beyond that range, 300blk walks with the rest of pack performance wise for a short bit, then gets left behind.

          Some years I shoot more. Some I shoot less. Right now I am track for a typical round count year somewhere about 8000 rounds. 300blk doesn’t work for me performance or dollar wise.

          No worries.


          • Scott Ladrochelle

            I have always believed the 5.56mm makes it’s own reputation, good or bad. No cartridge makes the 5.56mm bad, the .300 Blackout is just a better cartridge and absolutely the .308 is a better cartridge than the .300 Blackout. Simply if you only want to shoot 5.56mm in your AR platform, go right ahead, God Bless you. The .300 Blackout (I shoot mostly Supersonic ammo out of mine) has good consistent penetration and does more damage than the 5.56mm which is why it is legal to use on deer in the state I am now in and the 5.56mm is not. Lately there are a lot of cartridges available as upgrades over the 5.56mm AR, don’t get miffed about it. I am sorry that you think the comment “The government adopted the 5.56mm under the guise that it was better to
            wound an enemy, I felt somewhat better with a resounding stop.” was a crack, it wasn’t intended that way. But that is exactly what we were told when the weapon first came online!

          • You say the 308 is better than 300blk and 556.

            Yes and no. Depends on having the right tool for the job.

            You stated earlier that you were issued a 308 M-14.


            I am saying a 308 battle rifle isn’t optimal for high volume fire at room distances. My opinion is not unique in the matter.

            But I was shooting 308 at 1000 yards just 2 days ago. Does that mean 308 is “more better”? That is up to you to decide.

            For me….shooting 300blk supersonic and unsupressed is the expansive and long way around to the barn door.

            But I am looking at a ratio of performance, vs cost vs right tool for my application.

            For me…the ONLY gun the AR-pattern 300blk, subsonic, suppressed rifle competed with and beats is the HK MP-5SD.

            High-volume fire. Super, super quiet, at room distances, with AR ergos and under duress….could be pressed into taking a 200-300 yard shot outdoors while evacuating to a chopper? The 300blk beats the 9mm SD.

            That’s not my universe. Yours may be different.


          • Scott Ladrochelle

            The .300 beats the 5.56mm when it comes to penetration under light to medium cover! For most of us that means it beats the same rifle in 5.56mm! (I won’t even go into the water beading problems with the .22 bore!) Apparently a lot of Vietnam soldiers Sailors and Marines felt the same way as they risked drawing friendly fire by carrying the similar bored AK during that conflict. As for more recent events the Afghan and Iraqi vets at our VFW’s clearly line up behind the AK being the superior weapon in their theatres. (I might add that my acquaintances in those two groups are rather vocal in their interest in the .300 blackout firing AR’s.) If you LIKE the 5.56mm great, I am happy for you! But you are really a sore thumb standing alone in the wilderness that will not listen to reason or combat veterans. My 18 year old son knows, where we live, the 5.56mm does NOT punch through the under brush reliably and is in the middle of a .300 blackout upgrade. Our actual shooting results at 600 and 700 yards have also shown better results than the 5.56. In fact the Army is looking for a replacement for the 5.56mm firing weapons systems after our troops AND allies asked for a longer ranged cartridge with better knock down and wind shedding power! Please enjoy your .22, but don’t try to tell me that it is BETTER in any way than the upgrades to that platform! It isn’t!

          • Again…..if you can make the math work for you shooting, buying and carrying 300blk, rock on. It works really well as a suppressed round in AR pattern rifles at room clearing distances. It replaces the MP-5SD 9mm effectively and is an upgrade in that application.

            You invested in it and have no obligation to justify how you spend your dollars to me. Nor am I offended or put out you feel differently.

            As for the future of military service weapons and calibers, I am not much of a gambling man. This is generally because I don’t take risks I can’t influence. But in this case, I would almost be willing to bet money that US DOD will never, ever, ever select 300blk as the STANDARD infantry service rifle caliber.

            Almost. Here’s why…

            If DOD completely switches to 300blk, guess what? I’m buying a 300blk. Half my logic against it goes out the window. Since every maker of ammo and firearms worldwide will produce gobs and gobs of support for it. Logistics is king. This is doubly true for a civilian who has to pay his own freight.

            But right now, I’d be willing to guess; maybe possibly, that yearly 6.5CM gets more rounds fired in the US than 300blk. Could be wrong. But even then, I bet it’s close. Which is saying something when you consider most CM’s are shot in bolt guns.

            You can’t claim the mantle of standard until you actually are.

            Be well.


          • Jason Bowen

            This is how I feel about it. My pistol is to get me to my Blackout, my Blackout gets me to my rifle. It’s an intermediate weapon.

          • Think about what you just typed. “My pistol gets me to my blackout. My blackout gets me to my rifle.”


            Is your 300 going to be more handy than your “rifle” on your person? Maybe? Maybe not? I doubt it. I’ve yet to see someone carry a 300 in a 3 o’clock holster longer than it takes to post the pic on the internet.

            For me, it’s not. Carrying a “rifle” is the same as carrying a 300. Ditto for “getting to it”.

            Now let’s look at realities of “combat”. Unless you are a Marine attacking Fallujah, you’ll finish with whatever weapon you started with.

            And if you are fighting off Jihadi’s like World War Z and falling back to deeper and deeper positions, why would you start that fight with a pistol caliber to begin with?

            Unless that is what you are carrying? And if it’s that bad? Why go intermediate when you can go Rifle?

            I’d bet you drop a B61 nuke if it was handy.

            Summation: shoot and carry what floats your boat. If 300 gets you armed and trained and a 5.56 or Hi-point doesn’t? Thumbs up!!!!

            But we don’t really need to tell ghost stories as adults, do we?


          • Jason Bowen

            Well, it was more like my pistol is on me, that gets me to my small trunk of my car, and if then I make it home to my main stuff. It wasn’t meant as all this is in one place. Yeah, if given the immediate choice of weapon my rifle comes first. I’m not great with words.

          • The “small trunk” of your car isn’t a logical justification of a 300 vs a “rifle”.

            If you wanted to get a rifle in that Trunk, you could. Easily. And if you want to carry a 300 there instead, that’s fine. It is what it is: Your choice.

            But like I said before…let’s not tell ghost stories.


      • Jason Bowen

        Hey Marky, what’s your opinion of the fact that Blackout has the same energy out of a short barrel as a 5.56 does out of a long barrel? That’s part of the reason I like it, the ability to have 5.56 power out of a compact weapon, and the muzzle flash isn’t as bad from unburnt powder like a 5.56 SBR would have.

        • You are correct. Off the top of my head, I think the 300blk reaches peak performce Barrel wise at something like 7-9inches of Barrel.

          So if you are looking to SBR (10 inches or less) and suppressed, 300blk is more efficient with Uber short rifles.

          And you are using it at Uber short distances relatively speaking as well.

          Which is my argument for it: Uber suppressed (sub-sonic) at room clearing distances. It’s a win.

          But I personally get more use out of a 5.56 14” Barrel over a longer set of ranges.

          Or even a 10” 5.56 suppressed with sonic crack of super-sonic ammo.

          300blk is a room gun.
          5.56 is a room to cornfield gun.
          308 is football field to edge of farm gun.

          Devite from that, and you are into major boutique scenarios, IMO.


  • Rivvi Kordia

    So your reasoning for not using the round is operator error? Having nothing to do with the round or the weapon solely because some idiot puts the wrong ammo in a gun. Well I guess we all know how we should view your gun advice.

    • That’s a fair statement and I’m OK with it.

      But let’s be 100% consistent across the board: this is a issue a user / owner needs to at least acknowledge as something to watch out for. I suspect too many kids are whistling past the graveyard in this.

      If he or she can justify carrying a squirt gun, then all is well. If you can justify carrying 300blk, great. At least I know that person has at least thought it through.

      I have not been able to justify 300blk in any role other than MP5-SD, uber-suppressed, high volume of fire, at room distances. It beats the MP-5 since someone can step outside a building and take a 200-300 yard shot if needed. The MP-5 sucks at that last detail. And 300blk isn’t the greatest at the last part. But it’s better than 9mm.

      Bottom line: I can’t logically justify 300blk as an everyday round. Supersonic? That almost seems retarded.

      But I’ll throw you a bone: if NATO switches to 300blk as THE service round? And every NATO standard infantry rifle chambers it? And every maker cranks out 50 shades of loadings? I’ll reevaluate.

      But I live and breathe in a 5.56 world. And I shoot ALOT. And I have to pay for MOST of my ammo.

      But if some kid has a 300blk AR. And it gives him a boner. And he shoots his 500-1000 rounds a year (maybe. Being generous), no big deal.

      But 300 is still a boutique caliber in the real world.


      • Rivvi Kordia

        Just responding to the question. If operators in the field are asking for more penetration then I say Grendel or 300. If the military refit every rifle and ordered bulk from ammunition manufacturers they would get the price down. I have always agreed we should not be outgunned by our enemies. The 556 is more accurate than the 762 to me it’s the platform the AR/M4 platform is inherently more accurate so base the higher power round on a proven and very adaptable platform.