Tuning What reg pressure for Altaros disco .22cal

I'd go with 100 bar, it should give you about 1450 psi, around 800 fps with a JSB 18's, 850 fps with crosman 14's, somewhere close to there, the 2000 psi fill would dictate a lower reg setting for more shots per fill. not sure what you're getting before the reg, but you should get something like 20 shots with that reg setting, adjusting the Hammer spring down will give more shots but less fps,