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Not sure how to answer that one but here goes. I just ment that 250-275 is probably an exception. Flash will agree with me that the majority of people that use E-Cockers (Race, Sandridge, Hyper fram, ect) have run into problems when trying to use super low pressures. The valve won't recharge fast enough to close all the way and can make the gun "fart", not recock, and have velocity dropoff.