I haven't got a chrono out here, but my .22 on 5 pumps looked like it must have been doing at least 4.5, probably nearer 6 FP from the trajectory and impact at 15 yards. Excellent accuracy too.

Sounds a lot more "pump efficient" than Tony's 4.5 on 10 pumps - and this is a short .22 1322 barrel ( I converted it from a longer barreled .177 specifically for rats) - have you chrono'd yours at a similar number of pumps ? Seemed a fair bit spicier on 8 pumps too, but it's just too boring to try any more...