The point is that the 375H&H and 9.3x62 aren't massively "hot-rodded" - they can shoot their heavy bullets without excessive pressure and yet still maintain useful velocity and get massive penetration. You may well get 2200fps at 55,000psi with 400 grain bullets in the 45-70 - but look at the SD of a 400grain .45 calibre as compared to a 400 grain .40 cal or 350gr .375 cal. It may not mean all that much for boar and bear, but I'm dead sure it does for buff and ele!