As a very rough approximate I have a semi-auto .177 CO2 rifle (Crossman brand, model name unknown) with 12 round speed-loaders. It gets 4 full speed load clips on each 12gm CO2 cartridge before I start to notice a degradation in trajectory. The muzzle energy is 8 ft/lb @ 1.36 joules per ft/lb. This would give 8 x 1.36 x 48 = 522 joules until the pressure of the gas drops to the point where I change the cartridge.
However I suspect the true energy is higher as this rifle seems to waste a lot of gas. There is significant noticeable gas blow back and CO2 smell from the weapon, which does not happen with some other models.
BTW I we are not measuring the actual energy of the gas (that would require e=mc^2) but the usable energy from gas pressure.
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