I use a blend of duster gas (HFC-134a) and propane on extremely hot days (28℃ and above). I give each mag a good two second shot of duster, then top it up with propane. This blend keeps the velocity from spiking in the heat. You could also run pure duster, but that'll take a good 100 fps off the BBs.
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* * * * * * * * * Rob Bye
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