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increased velocity means less expansion and less penetration. Heavier grains are better.
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The heavier vs. lighter is an ongoing debate with subjective opinions usually based on what someone read somewhere.
With limited street results available, I believe 155 HST has been more effective than either 165 or 180. As a matter of fact, I don't think 155 gr. .40 S&W has taken a back seat to anything in actual shootings. Unless it's some hot 135 gr. loads.