Thousands of elk were downed 11 decades ago with .30-30's and .30-40's. Every one of them never knew what hit them. As far as I know, their species has not gotten more "bullet proof" since then.
A lot of moose suffered the same demise with both cartidges back then.
No not really energy does not equal power. energy is a poor landmark for power and what damage can be done by a round.
a 5.56 has more energy than the original 45/70 BP loading, but I know which I'm taking for large game.
BTW a 180gr @ 2400 fps from Krag has 10% more momentum than a 130gr @ 3000 fps from a 270.
