Foster slugs can be shot in any smooth bore depending on the choke. Most people warn not to shoot Fosters in a full choke but my most accurate shotguns have been modified or better. The term "rifled" slug is really a selling term. The supposed fins are supposed to help stabilize the slug. But in actuality, they do little. Glue some fins on a rock some time and throw it. Doesn't help much to stabilize it.
Saboted slugs on the other hand are intended for imp. cyl. or open bore guns, or rifled barrels. There a different breed and should be treated as such. NEVER EVER shoot a saboted slug in a full choke shotgun. Brennekes fall into this group. They are hardened and intended for dangerous game.
Fosters are made of almost pure lead. They are very forgiving when they hit a restriction, like a choke. For years, because of liability, Remington kept theres around .685. Way small. Winny and Federal were around .728(?).
Sabots on the other hand have a hard plastic case that encompasses the slug. They won't give and will ruin a full choke or possibly injure someone.
Damascus barrels fall into the NEVER EVER shoot any slug in them. There are still some of them floating around out there and the unknowing teenage that sneeks dads prize out for a slug shoot usually gets a surprize.
Accuracy: My old H&R 12 gauge single smoothbore with a scope will group under 2" at 75 yards all day long. My 870, 12 gauge is darn near that. Much depends on the sighting system that you use. I favor a 1.5-2X scope. In Penn. they used to have slug shooting contests with special bolt action guns. You would be amazed at how accurate a slug gun can get! :grin:
