C02 instead of Air?

Hi jimreed1948 CO2 probably will limit your power and is very temperature dependent, basically if you keep shooting your gun, it cools down the gun and power will drop. I looked at this chart http://co2airguns.net/Collection/technical_data/CO2_Temp_data.htm

was it like 60-70bar at 80F 27C or so. and when it gets cold, not much power left i am afraid, sub12fpe in .22 is OK when it is hot outside.
And is almost self regulating as long as you dont shoot to fast/many pellets in succession.
There are quite many CO2 guns out there. More for fun than serious precision shooting