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The .577/450 loaded with black powder, was about 100fps faster than the black powder loaded .45/70 when used with the same weight bullet. Smokless powder does change that, somewhat.
; I can see where people who aren't handloaders might look at WW or RP factory .45/70 ammo and sneer at the .45/70's ballistics. I understand there would be confusion in this case. Afterall, how can anyone take 1,320fps with a 405gr. bullet seriously, for anything that might bite back?
; Considering the same weight bullet with modern designed jackets and cores, driven at 2,100fps changes things a bit.
; The BP rounds ran around 20,000PSI, whereas these modern rifles can handle up to 43,000PSI. This changes things a bit.

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Thanks for the info. An African PH once said to me the .577/.450 was the equivalent of the .45/70 so I just relied on that. I knew someone would correct me if I was mistaken.

This PH was actually sympathetic to the .45/70 in lever action form as he had a good number of horses and used them for horse back game viewing safaris. He had an idea of using a .45/70 as a backup rifle.