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My family waste more energy leaving the lights on in a room when they leave than I will ever waste on animals with fully penetrating bullets.
I drive V8s and V10 engines.
Ain't too concerned with wasted energy in bullets.
A little concerned about using anything smaller than a 375 on deer.
But the 460 Weatherby with a 500-grain Swift A-frame bonded-core partitions will stop small deer reliably.
As far as bullet expansion, think there is enough research to conclude that whatever expansion a bullet is going to do will start within the first couple of inches and be complete within six inches.
I prefer complete penetration on any game animal regardless of how far the bullet has to travel inside the animal.
I have spent all the time tracking after a shot that I ever intend to. I like holes on both sides that you can stick your hole arm through.
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