Everyone thinks of the 45-70 as the slow old cartridge that throws big ole bullets down range to knock over Elk-Moose and Bear and bullet construction should be of no concern.But the fact is the Modern 45-70 loaded to it's capabuility is as good as the other so called Elk Rifles if a quality bullet is used.Here is some comaprisons useing Hodgdon #27 and #26 maximum loads,not factory loads,max loads against the 45-70 with a 300 grain Nosler all with a 24 inch barrel except when noted.
30-06 200 gr-----2577fps@ 49,400CUP--45-70 300 Nosler--2500 fps-41,000 PSI
30-06 220 gr--2459fps@48,600CUP-45-70 300 gr-2500 fps
30-06 250 gr--2237fps@40,600CUP-45-70 300 gr-2500 fps
No comparison and the 06 is a heck of an all around rifle.
300H&H mag 250 gr-2616fps-- 45-70 300 gr-2500 fps
308 Norma Mag(26")250 gr-2501 fps@53,500CUP-45-70 300 gr-2500 fps
.338-06-275 gr-2348 fps-45-70 300 gr-2500 fps
338 Win Mag 300 gr-2447@51,500CUP-45-70 300 gr-2500 fps
35 Whelen 300 gr-2251 fps@49.500CUP-45-70 300 gr-2500 fps
375 H&H 300 gr-2645 fps@49.500-45-70 300 gr-2500 fps.
300 Weatherby(26") 250 gr-2571 fps@54,000 CUP-45-70(24 in) 300 gr-2500 fps
As you can see the 45-70 with the 300 Nosler is right in the ball park and better than some with a 24 inch barrel.Now if we went to the 26 inch CB you could add anothe 50+ FPS to the 45-70 and there all under the 43,500 PSI.Would you use inexpensive bullets in these other calibers for Elk Moose and Bear?I sure wouldn't.There at there best with premium bullets and the 45-70 should be the same.
Just my opinon.Jayco.