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You couild get a box each of several brands of ammo, then use a "sacraficial" barrel and crhonograph a a few shots from each box as you cut down the barrel in increments. A used barrel for a T/C doesn't cost a lot. That would give some useful data.
Quickload could do that only if you know the characteristcs of each powder and bullet used in each brand. You could also Use an Oehler chamber strain gage rig to get the pressure/time curves. You'd still have to make a lot of shots on different ammo unless you've already chosen what you're going to use.
What's so important about not giving up any velocity? Isn't it to be subsonic? You may want to give up velocity depending on the ammo you use.
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