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trying to get a BM500 HV up to speed for Unlimited 50m . we raised the reg up to the point of no increase in velocity about 630 fps with 25 gn pellets ,, THEN dropped in the heavier hammer spring from my HM1000X and it went up to 680 fps , and thats it looking for suggestions like...

wondering if there`s a pressure gauge that will WiFi / Bluetooth to phone App,, Plus maybe an App that shows pressures and chrono Velocities for testing /tuning ??? thanks Dave