Why, there isn't a regulator as such in HW100 and although the shot count in a carbine is around 60 in .177 isn't great, there are sufficient shots for targets or hunting at 200 bar, which is where I charge to. No point in damaging a successful gun by over filling, anyway I think 190 bar is better as the pressure in the cylinder doesn't cause as many issues as a full 200 fill and only a few less (5) shots as you can shoot right down to 100 bar before it really drops off.
Ian
HW100KT .177 MTC Mamba light 3-12x44
Daystate Mk4 Platinum .177 MTC Viper10x44 (HFT)