QuickLoad was using +P pressure estimates. I'd be surprised if Power Pistol wasn't a top performer. It's usually very close to max velocity, with 800x being right there with it. Power Pistol meters a lot better than 800x though.
QuickLoad doesn't do as well with straight wall (or nearly so) cartridges, in absolute terms, but its relative values are pretty close. In other words, the velocities/pressures might be off across the board but its top performer is probably correct even if the exact numbers aren't right.
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