380 vs 9mm - i believe both rounds are .355
the difference is the length - if i remember correctly, the 9mm case is 2mm longer. those 2mm make a lot of difference in how fast a heavier bullet can be sent downrange.
i've never had a cause to brandish my weapons, but i've always heard that the most effective weapon is the one that you can hit the target with. no one wants to be shot with ANYTHING regardless of caliber.
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