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Old December 3, 2019, 01:58 PM   #13
44 AMP
Join Date: March 11, 2006
Location: Upper US
Posts: 20,988
I have been surprised at how soft a standard Foster slug really is,
I don't think they are pure lead, but they are pretty soft, because they need to be. The "vanes" on a rifled slug (the part that looks like rifling) aren't there to cause spin, they are there to provide "room" for the slug to compress, in order to pass safely through any choke encountered. They need to be soft in order to do that. Shotgun barrels are thin, and don't take well to higher pressures than designed for.

The Forster "rifled slug" was made to work in ALL shotguns no matter the choke. While cylinder bores usually give best results, slugs are used in all choke guns, including full choke, and they need to be on the soft side to squeeze through the choke without putting undue stress on the gun.
All else being equal (and it almost never is) bigger bullets tend to work better.
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