Need New O-Rings?
 

I timed this for accuracy, and I am getting 44 BB's on a 3.0 second (variance of +/- 0.2 seconds) propane fill with my KSC G18c. 23/23 BB's out of first load 21/23 BB's out of second. This is consistent at 22*c.

I've did some research and with propane I should apparently be getting ~80 BB's from a single refill. I've damaged magazines before from overfilling and I've found 3 seconds to be a conservative safe point.

Any suggestions?