I think it must be down to individual guns and filling systems. I charge my S200 to 180 bar "indicated" on my Hills pump, any more is wasted effort. I then fire a magazine through it and then have 5 magazines more worth of air with very little variation. The pump then seems to kick in again at about 100 bar (so I assume that's where it got to) Mine is .22 and I use AA field running to approx 11.5 ft/lb. This gun seems to hate heavier pellets so I'm hopeful that I'll stay on the right side of the law! I can't say I'm over confident about my pressures but don't seem to be able to push it over the limit.

Cheers Chris.