How would a 45/70 work for Lion? From what I've read on this cartridge
, it has some decent stopping power.
Further, we should ask ourselves why the shooting public ran away from the 45-70 and flocked to the 30-30 beginning in 1894. In the field it has been observed that velocities above 2000 fps (with appropriate sectional density) kill much better than velocities in the 1500 fps range. The 45-70 with 500 grain bullets is a 1500 fps affair.
1) It couldn't possibly have been the fact that the .30-30 was the first smokeless sporting cartridge, offered in a light, handy repeater - in 189
5, by the way, could it? American shooters and hunters have always had a tendency to go for the latest and fastest.
But, as you might have noticed, the .45-70 is still going strong after all these years. How is that possible if we've "run away" from that cartridge?
2) Quoting Trapdoor Springfield ballistics as representative of what modern .45-70 cartridge/rifle ballistics are is just as fair as quoting .44-40 ballistics for a .44 magnum.
3) "In the field it has been observed that velocities above 2000 fps (with appropriate sectional density) kill much better than velocities in the 1500 fps range." In the field observed by whom? You don't consider bullet weight to be a factor? Are you saying that 500fps additional speed will overcome a 330 -350 grain advantage in bullet weight at any reasonable range? Those old black powder .45-70s did a pretty good job of knocking down American Bison, a pretty large critter, not to mention elk and large bears.
4) There are modern .45-70 loads that fall within a few hundred feet shy of a .458WM, exceeding the 2000 fps figure you mentioned. I don't think there are any lions out there that could tell the difference.