My buddy bought a Pietta 1858 tonight as his first BP revolver. I am about out of remington #10 caps, but have an ample supply of RWS 1075 Plus and CCI #11s I can share with him. He will try those on his factory nipples (neither fits my Uberti factory nipples), but if they don't fit I imagine that a set of aftermarket nipples is probably the way to go. Is slixshot the best choice? I think the biggest issue is finding nipples that will fit the caps I have on hand.