There are several areas in the US that mandate slugs for deer hunting, and even where it’s not law, there’s just something about smacking a buck with such a big hunk of lead. Hit well, they go down HARD.
There has been so much advancement in slug technology in the past two decades that you do have to ask yourself if you’re properly matching the right slug to your gun. The old Foster-type slug is designed to be fired from a smoothbore, and no, the “rifling” on a rifled slug does not cause them to spin in flight. That “rifling” is there so the lead has somewhere to go if the slug gets squeezed going through a choke. These type of slugs are stabilized by having their weight forward. To illustrate, take an empty soup can, fill it 2/3 full of water and freeze it. Once frozen, try throwing the can with the ice-filled end forward, then turn it around and see what happens when you try to throw it with the ice at the rear. You’ll see that it naturally wants to fly ice end forward, and that’s how these slugs are stabilized.
There are other slugs designed for smoothbore shotguns that are drag stabilized. These style slugs usually have some sort of plastic wad attached at the base to create base drag and keep the slug point-on. Lots of times the wad separates from the slug, but don’t worry about it because these slugs are typically designed so that if the “wad” breaks away, the slug stabilizes like a Foster.
Lastly, there are saboted slugs. Their designs usually is in the shape of a conventional bullet or air rifle pellet encased in a plastic sabot. Just like a regular bullet or pellet, these are spin stabilized and you have to shoot them from a rifled bore or they’ll tumble in flight and your accuracy will suck.
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