Here is a quote from one experienced member that says it all:

"The problem is that a 45-70 has anemic velocity when using a 500 grain bullet (1550 fps), which in turn leads to abysmal penetration. The 458 Win Mag with its original loads of 500 grain bullets going 1700 to 1900 fps would not reach an elephant's brain on a frontal shot. There is no reason to expect superior performance by dropping the velocity another 300 fps."

I tried to edit this post but somehow failed. I tried to add that a 45/70 Dr would be great fun to shoot and hunt with, just not DG.

JPK