Pedersoli Rolling Block (and Sharps) replica .45-70s are CIP rated for 29,000 CUP, which is about the same as SAAMI maximum 28,000 psi; and well above the usual 18,000 Trapdoor limit. A Rolling Block with its crooked stock might be all the fun you want at the low end, though. Blackpowder ballistics will do a lot, you don't need to magnumize the. Rolling Block Mississippi Classic 26". The Rolling Block Mississippi rifle is of itself a Classic style in this new version with light and practical features, finished so that it looks like the rifles of the late 1800's. The high carbon steel barrel, is broach rifled. The alloy frame is embellished with a nice engraving, old silver colour.