The science stuff is great but I never had the head for math, field experience I can relate to. My PGP when I bought it back in 88' I could get 30 usable shots plus another 10 "oh crap they are still coming" shots before I HAD to change my 12 gram. When I used my Nelson based Bloodsucker with a Rat Attack I could get 20 usable shots with another 5 that were weak but could make the other team duck, shots. That being said if the weather was very cold (below 50F) I would lose about 1/4-1/3 of my efficiency, with lots of snow shooting out my marker. So my thinking at least for these 2 markers was liquid bad, co2 in gas state good, hehe hope that helps.
Old, Heavy and Loud...I am a lot like my VM.
Dum vivimus vivamus! While we live, let us live!