Interesting article/video where Paul Harrell talks about which cartridge he feels is a better performer. Tests were conducted using Glocks G20 & G21 while using the same brands of Ammo in each caliber. Video runs 21 minutes.
10mm vs 45 ACP — Which is Better? - The Mag Life
Well, define better. It depends on what you want to get out of it. Here are some questions to ask yourself when choosing 10mm vs 45 ACP.
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