To be fair the 45-70 with a 405 grain bullet at 1300 fps in a 7.5 lb rifle a normal charge will get you 15ft/lbs@11fps vs the 460 weatherby 500 grain at 2700 in a 11lb rifle that with a normal charge will get you 108 ft.lbs@25fps. That 11fps is a really big deal compared to the 25fps (more than twice the recoil impulse velocity). A push to the shoulder vs a punch.

I disagree with the last bit you wrote because there are much better options to achieve the same goals. Waste is waste, 5 times as much powder, broken stock, hard on the body, 3.5lbs more rifle weight (5 pounds more than several of my center fire rifles), much greater cost, etc...

Small and fast is great with the proper bullets. Big and slow is great with the proper bullets. Big and fast with any bullet or slow and small with any bullet are just not the best way to do this thing.

Reminds me of a guy in the Golden Days Drag Races in '86 riding a drag bike. He, nor his thrown belt, nor his fire impressed me much either.