Reply To: Regulator is in…big differance…Hatsan 44-10
I have the same set up, AT44 QE .25 with an Altaros regulaor. I get 18 shots (2 clips) at ~850fps right now, but have had it tuned for 4 clips @ ~650. I did do a little valve work, but it wasn’t anything too complicated, just plugging the holes on the “back” of the valve and opening the ones on the front. What regulator do you have? With mine there is a flat head screw inside the regulator that tunes the speeds. About 1/8″ turn equates to ~7fps and there is about 100ish total fps worth of tuning in the reg and the rest is in the gun itself. Check out rsterne’s work. http://www.canadianairguns.com/showthread.php?656-Hatsan-25-cal-AT44S-10-Long-Mods He is pretty much the pioneer with the hatsan AT line as far as tuning goes and has a ton of pics and information and even makes graphs and whatnot.