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I don't see how firing .40 through a Glock 20 is going to tell you anything about what it would be like to own a USP40 or G23.
Calibers are discussed sometimes like they each have their special characteristics, like a dog breed or something. But they are just different ways of getting a piece of lead up to muzzle velocity.
If you get a 180 grain bullet up to 950 fps second, you aren't going to be able to tell if you started with a 9x23, 10mm, .40 or .45 ACP casing. The recoil impulse and terminal ballistics inside 50 yards are going to be pretty much identical.
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