I re- installed the flat/tip-less FP body in the breechblock, then I drilled the central FP hole in the breech face, simultaneously letting the drill bit tip also start a hole in the firing pin body for the new FP tip. I temporarily removed the RF foring pin from the breechblock and ground the RF tip off, leaving the face of the FP body flat. I marked the center of the breechblock via dropping a black Sharpie downbore before removing the breechblock from the receiver for drilling the breechblock face centrally for the new FP tip with a sacrificial 1/16" drill. I would not rechamber a #4 RB for any other CF cartridge (they are over 100 years old). 32 Short Colt loads (Winchester makes a few runs each year). FWIW, I converted my solid frame (I wouldn't do a takedown) #4 RB.
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