Danindetroit
New member
I know this is for blackpowder, but I think you guys are more knowledgable in this area than anybody else. I want to get a rifled barrel for a shotgun to shoot win partition gold slugs. They are .50 cal bullets at .9185" in a sabot that is .725"dia x 1.087" long. Do I use the sabot dims, or the bullet dims, when finding the correct twist for the barrel. With the bullet I get a 1 in 38" with the sabot I get a 1 in 72". I realise this ammo might not work in my gun but when I use the bullet it is close to the 1 in 36" twist of the rifled barrel, and was figuring that once the bullet leaves the barrel the bullet will almost immediately leave the sabot behind and possibly stabilise. Sorry for posting a shotgun question here, but I thought that you guys would know about this type of ballistic question.