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Black powder revolvers can be a lot of fun to shoot. I have, and shoot about teo or three times a year a .36 cal Navy Colt replica I built from a kit. Suprisingly both the ballisitcs and recaoil are roughly similar to a .38 spec. Never tried anything bigger but I would think the recoil might be fairly heavy for what you are talking about, but rember the gun is probably pretty hefty too, so it should absorb a decent amount of the recoil. There is also a black powder substitute that can be used in these pistols (I think the name is pyrodex) that is much less corrosive and makes cleaning easier.

Have fun.

DB