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Generally speaking, pressure produces very little wear on the handgun, providing it is within the gun's design limits.
What produces wear on guns is recoil. Heavy bullets pushed at high velocity generate more recoil energy, which means slides or breech blocks are slammed to the stops with greater force than with lighter bullets.
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Correct.
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The biggest wear on semi auto handguns is the slide hammering the frame.
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Also correct. And the slide impact (except in gas-operated handguns) is the result of recoil.