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Several years ago the Accurate #1 manual listed a number of smokeless loads for the .50-70 cartridge. Since there was no SAMMI pressure standard for this round, a 65 grain charge of FFg black powder was fired behind a 550 grain cast bullet. The 22,500 PSI result was then used as a pressure limit for the 50-70 cartridge. This provided an interesting contrast with the 18,000 PSI SAMMI maximum pressure standard for 50-70's younger cousin, the 45-70 cartridge.
 

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There's two issues at work here. Maximum pressure and the pressure/time relationship. IIRC, smokeless has a much steeper pressure curve to peak.
 

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William R. Moore said:
There's two issues at work here. Maximum pressure and the pressure/time relationship. IIRC, smokeless has a much steeper pressure curve to peak.
Of that I am aware. Smokeless pressure curves can also be changed with a slower burning rate.
 
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