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Most agencies choose based on budget, whatever meets the specs and is in budget is what gets bought..
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Since a majority of agencies in the country went to .40, which cost them more, it's inaccurate to say they choose completely based on budget.
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Total fallacy that 45,40 and 9mm all have the same performance.
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Of course it is.
Did you think someone here claimed they did?
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E-MCsquared - The force of the recoil = the force going forward
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If you're referring to Newton's 3rd law, it's true.
Unfortunately that has little to do with terminal performance of handgun projectiles. Unless you believe that muzzle energy is indicative of performance.
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Are you telling me 9mm per same specs on a given gun recoils more than a 45??? Sorry no...
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Again, you're apparently readings things I must have missed.
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45 certainly can expand to a greater diameter, 40 and 9mm are closer in expansion.
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Correct. Some 9mm loads expand more and penetrate deeper than some .40 loads, and vice versa.
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The main thing is accuracy is king and in general the diameter of the cavity is significant enough among all these rounds to produce the results needed for self defense.
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Indeed. Shot placement trumps any differences in performance.
Which is why the easier to shoot 9mm can be argued as a better choice than the similarly performing, but heavier recoiling .40.
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Shoot whatever works for you, but 9mm is only king of self defense rounds if its what you like and choose to use, same for all the other rounds.
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"King of self defense rounds"? Again, did I miss another post?
But if you're suggesting that folks should use what they like and shoot well, I agree.