Originally Posted by The Flint&Fly Guy
Most of the examples here use a shot cup of some sort, that would keep it from touching the rifling. And even if it did would it leave significantly more than the maxiball, or the bp fowling for that matter!
I think the issue is the shot gliding over the rifling without fully biting into it.
A lead slug is deformed to fill the barrel and twist with the rifling. One thought is that shot does not deform to the same extent, and may be "shaved" by passing over the rifling, causing more fouling. Shot cup may solve the whole problem.
To the OP, there is only one way to find out! It's not like you are going to elmer fudd the thing. Give it a try and report back.