Quote Originally Posted by xx.Morph.xx View Post
I'm assuming you mean a pistol or revolver ?

If so I have 2, a Pietta Cattleman in.44 & a Westlake Armscor in .38 (Sorry but neither are for sale at the moment) both proofed for Nitro propellant.

Your variation request should be for a Muzzle Loading Revolver (or "Pistol" if going for a single shot, but that's another licencing can of worms) it matters not a jot to the variation what powder you will be feeding it.
I already have a Rogers and Spencer. Unfortunately it is now virtually impossible to get spares for it. Also the mess involved in shooting it puts me off a bit. Why doesn't someone produce a mess free powder which doesn't turn your muzzle loader into a grenade?
INRS surely.