All CO2 obeys Boyles' and Charles' laws of pressure volume & temperature. Maybe the differences you found were due to the temperature of the gun dropping during the tests as more shots were fired. At a given temperature, as long as you have some liquid in the cartridge, the pressures should be the same.
Smaller CO2 tanks will cool down much faster than larger CO2 tanks so when shooting rapped fire with a 12 gram CO2 cartridge you may only expect to get about 20-30 good shots before taking a break and letting your gun and the CO2 tank warm up again.
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