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I thought more powder = deeper penetration.
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It depends entirely on the bullet's design for specific performance against specific materials at specific velocities. Modern weapons/cartridges are literally an engineering system of systems to this end. Push things beyond design and those things come unglued.
EX:
A 22 Long Rifle drundling along at 1,000 fps will get
far deeper penetration with its 40gr bullet than a 220 Swift with its 40-grainer ....doing 4,200.
( I gare-on-tee.
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