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That does bring me to another question. I always hear that .45 ACP is slower and won't over penetrate, but if you look at the FPS they list for some of the rounds, the difference is only 200 fps.
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1. .....200 f/sec is huge when you are talking about an increase of 200 f/sec from 800 to 1000 f/sec: that 20%! That's like the difference between a 150 gr bullet in a .30/30 and a .30-06 (20% of 2800= 560...... 2800-560= darn near the 2300 f/sec a .30/30 launches a 150 grain bullet.....)
2. The .45 has much more frontal area than the 9mm to resist pentrating a target..... while a 9mm HP can hope to expand to .45" .... a .45 is already there.