From what I've read, it should.
I wasn't using this mold or shooting these Minies, though I used to have a .45 (& would be keeping this if
i still had it.
I'm selling this for a friend.
I believe that he intended to but it is unused.
From what I've read, Minies work well in RB twist rifling. I got a .50 Minie mold from him, which I intend to shoot in my .50 SMR; I just haven't found time for casting any yet.