hpa reg info

Well, it all depends on the gun. Some have modifications power wise and some dont. There are a ton of variables. Some have different size HPA bottles and they can b filled to different pressures.

But, i recently had my QB78 Co2 gun converted to HPA via a 22 oz regulated bottle. I could get about 60 shots before the velocity dropped per shot. It was shooting 14.3 gr Crosman Premiers at about 690+ fps with very little deviation per shot.