Interesting post Vic, most 10m match rifles would punch a nice clean hole at 10m with a muzzle velocity of 600fps, but that does not answer your question. I'd suggest a Crosman 766 pump, chrono at each pump, shoot at 20m on paper, and compare results?
I've got a Rekord LP3 that runs about 250fps, I can try that at short range with wadcutters and see what it does?