I'm going to try some experiments this weekend with light loads. So far here and on the ML forum it sounds like the practice is safe as long as the problem of bore obstruction is resolved. WIth my Kodiak that means tapping the loads home with the brass hammer and cross checking the unprimed barrel for slippage, but I'm doing that anyway and have a marked ram rod.
I've been leery about a "mere" fifty cal for local bear issues if I take this beast on the trail, but four roundballs in quick order ought to do the trick if anything will.
Now the next question is, would that mean my muzzleloader is a "machine gun" under federal law!? Probably, and by extension that means every ML is a machine gun along with all roundball. ML's are excluded from "firearms", but the definition of machine guns embraces all "weapons" including parts of weapons, not just firearms. 26 U.S.C.S § 5845(b). Therefore an otherwise excluded ML becomes a prohbited machine gun because it is or can be loaded with multiple bullets which are discharged with a single trigger pull. Maybe I'll ask the ATF about it LOL