A 45-70 doesn't need to be shot at warp speed to get results, a 405 cast at 1600-1700 fps will do everything that needs doing with a 45-70.
The bison were wiped out by black powder loads doing barely 1200 fps and they were killing out at most distances people won't shoot with a scoped high power modern rifle.
Jacketed bullets from a 45-70 don't penetrate as good as cast due to the hardness of the cast alloy.
J bullets are rather soft, the faster they go, the faster they stop.
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