re: FBI 9MM Justification, FBI Training Division

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Capacity and effective firing rate

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This is the only logic-based, performance-based criteria to select 9mm (IMHO). There was a time when you couldn't get a heavier caliber in a concealable weapon. Now, it's hard to think of a weapon made in 9mm and not in .40 S&W (although I'm sure there are some.)

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marginal ballistics difference

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This is a really loaded analysis. "Marginal" is in the eyes of the shooter and target. If your super hot, composite alloy, molecularly bonded, computer designed, +P++ 9mm round stops the fight after 1 hit - then the difference is marginal. If the little extra *oomph* from a heavier bullet, making a larger wound channel, under the real world conditions of the platform, intermediate obstacles and target would have made the difference in you winning the gunfight and living, versus losing the gunfight and dying, the difference is likely going to be regarded as greater than marginal.

But, again, I'm not anti-9mm - I'm probably as pro-9mm as I have been in my life.

Still not much, but it is no longer anti -

That's progress, right Bap?