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Discussion Starter #1
I just bought a new P89 and will be reloading for it. I know there is a lot of opinions about what bullet weight is best in a 9mm, but the question I have is this: does shooting a heavy bullet like a 147gr create more wear and tear on an action, than say a 124gr. bullet ?

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A combination of muzzle velocity and bullet weight formulate muzzle energy. For every action there is an equal and opposite reaction so the opposite of muzzle energy is called impulse energy (IE). Impulse energy is what causes wear. Here's where it gets counter-intuitive ..... if you shoot factory equivelant loads and don't hot rod them, the lighter bullets will cause more damage than heavier bullets but only by a token amount. Here's a chart:

115 gr factory velocity = 1160 fps; IE = 344 ft lbs
124 gr Factory velocity = 1110 fps; IE = 339 ft lbs
147 gr factory velocity = 990 fps; IE = 320 ft lbs
 
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