Last edited by Hunter Rose; 09-02-2019 at 09:00 AM.
When I had USP 45s and was smitten with velocity I tested .45Super in my guns. That was too much fun for anything but range retardery, the guns ran fine though.
If both run reliably and accurately in your guns then I'd let some sort of test make my decision, such as running Bill Drills or failure drills on a timer maybe.
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I have read other's observations that with +P or +P+ velocities, recoil and magazine springs have to up to snuff. With increased slide velocities the magazine spring must be able to lift the next cartridge so the slide can pick it up. At least with recoil springs, one can tailor that spring to a particular round for proper function.
Doc answered that in post 4 of this thread.
You are confusing cycle of operation problems in 1911s etc with terminal ballistics issues (which don’t exist).Both versions work adequately. The standard pressure is more forgiving in a wider range of handguns. In a USP, both work well and there is a slight, but measurable increase in terminal performance with the +P.