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I seem to remember that the original GI smokeless load for the 45-70(load was M1898?) was 38.0gns of 3031 behind a 500gn cast lead bullet. The early barrels had really deep rifling in order to digest many loads of black powder without cleaning and so you need to use a dead soft alloy(20:1 or softer, and NO antimony) Do a little more research on this yourself , obviously, but if you like I'll check my notes, let me know. S/F...Ken M
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