|
363 doesn't = an un-ported cylinder, this could be attributing the to wonky readings.
When's the last time you cleaned out your chrono? Last week every gun I fired through my chrono read 275 FPS no matter what it actually was... When I cleaned everything out there was about 3 BB's worth of shavings in there and it started to read properly.
I'd to the cylinder heat trick to the piston head's O-ring and try to seal up some of the leaking areas and see if that makes a difference.
|