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Have some reservations about using hot loads in the Sharps...some of the loading for the 45/70 are way-way up there. The repro Sharps are pretty good recreations and the Sharps was one of the strongest BP actions made, the modern steel is stronger than the steel used in the originals, but I'd pass on the real hot loads....and would consider the factory 300gr. loadings (or their handloaded equals) the top end.
Did notice that in the past, some versions of the "Sproting" and "business" rifles were offered in 30-40...pretty high pressure, but a smaller head, so the back thrust was a bit less ...still, that's a big case head woring at 40K...BUT have not seen that round advertized recently (is it becasue they can't make enough of the big BP round rifles fast enough or becasue there was a problem with rounds running at that pressure?).
It's DAMNED hard to get a 'smith to OK any old gun's actual use...from the legal stand point, you can understand why.
Did notice that in the past, some versions of the "Sproting" and "business" rifles were offered in 30-40...pretty high pressure, but a smaller head, so the back thrust was a bit less ...still, that's a big case head woring at 40K...BUT have not seen that round advertized recently (is it becasue they can't make enough of the big BP round rifles fast enough or becasue there was a problem with rounds running at that pressure?).
It's DAMNED hard to get a 'smith to OK any old gun's actual use...from the legal stand point, you can understand why.