So, I fitted an Altaros regulator to my S400 (very old, pre-anti tamper)
I put it across the chrony, from 160 bar down. As expected, the fps was fairly consistant, but dropped ever so slightly from the start, down to the regulator set point, and then dropped faster below the reg set point. All good, just on fps variations. From 160 bar to 125 bar, it dropped about 10fps.
Unfortunately, this has not translated into great 25m benchrest results.... So I zero in at 160 bar (my bottle is a bit empty) great, first 5 shots perfect. Then the POI starts to climb, and climb, so after 20 shots I re-set the zero down 2 clicks. Its spot on again, until it comes off the reg, and drops as expected. So I re-fill and the POI is low again!
So I dont understand, why does the POI climb, as the fps slightly decreases on the regulator?
Thanks!