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In the world of shotgun slugs, there are slugs designed for unrifled bores and those for rifled bores. Sabot slugs contain a subcaliber projectile surrounded by a plastic strippable carrier that engages the rifling to impart spin to the projectile. Sabots must never be used in shotgun barrels with chokes or choke tubes because they blowup barrels and can damage both the gun and shooter.

Foster (a cup-shaped, hollow, 1 oz. lead slug) is designed for cylinder bore barrels (that is, the same diameter from breech to muzzle — 0.729-inch for a 12 ga.). The same is true for the Brenneke slug. The Brenneke originated in Europe and is a solid lead slug with the wad screwed to the base. The lead of these slugs can be compressed by a choked barrel, but the projectile will have no accuracy. They will usually not cause a problem for the gun or shooter, other than excessive recoil.

Therefore, Fosters and Brennekes for open choke or cylinder bore shotgun barrels. Sabot slugs for rifled shotgun barrels.