I think it is a bullet by bullet proposition. I find the 145gn X in the .270W very explosive, core exits, shrapnel cuts through the lungs, heart from chest shots. Emphatic killers.
The 178 Eldx .308 cal have a following with .308, 30/06 users, so must be working at sub magnum velocities. I've loaded some in the 06 for this winter's hunting.
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