My brother in law or bil as I call him, bought a pietta black powder revolver in .44 caliber and he is in the market for percussion caps but doesn't know what size, does anyone here know what size caps to use? I read something that revolvers use #10 caps and rifles use #11 caps but don't know it that is true cause I don't do anything with black powder. smokeless yes but black powder no! Our family made Kentucky long rifles and muskets in the mid 18th century and made firearms for the American Revolution Army and I have one of the long rifles and it is signed by our family gunsmith, other than that I have not idea about a black powder percussion revolver, so I need a little help with what size percussion cap to use, can someone help me out?