That's because liquid CO2 will evaporate to restore the CO2 partial pressure after each shot, but nothing similar happens for the air component. Therefore, the relative concentration of air, and therefore total pressure, would drop with each shot. Meanwhile, the concentration of CO2, and therefore average density, would rise.
What's worse, I think these effects would happen faster, making velocity fall off more quickly, than if the original fill had been 100% one gas or the other.
This is one reason I question whether CO2 + air mixtures can ever be superior to pure fills.
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