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However, what I posted is at least still true today.
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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.