I have one at 25 fpe with 14 pumps.
Quote from: Psipumper on January 30, 2023, 06:57:53 PMI have one at 25 fpe with 14 pumps.That seems very efficient at nearly 1.8 fpe/pump at pump #14! My 392 is 1.9 fpe/pump at pump #9 with 14.3gr pellets. I do most of my shooting at 3 - 5 pumps with light pellets and that yields 2.8 - 2.5 fpe/pump respectively. My 392 is modified with mac1 adjustable piston, some porting work, and the valve is packed. Charles is one of the pumper masters around here for sure.
Quote from: Hack21 on January 30, 2023, 07:21:02 PMQuote from: Psipumper on January 30, 2023, 06:57:53 PMI have one at 25 fpe with 14 pumps.That seems very efficient at nearly 1.8 fpe/pump at pump #14! My 392 is 1.9 fpe/pump at pump #9 with 14.3gr pellets. I do most of my shooting at 3 - 5 pumps with light pellets and that yields 2.8 - 2.5 fpe/pump respectively. My 392 is modified with mac1 adjustable piston, some porting work, and the valve is packed. Charles is one of the pumper masters around here for sure. The 392 has a swept volume of 58cc per pump. The 362 is 32cc per stroke. You would need to add that to the math to compare. 8 392 pumps is equal to 14 362 pumps in swept volume of air pumped.I have another 392 with 27 fpe @8 pumps. So 3.375 fpe/ pump for it so it is better than the 362 @ 14 by a small amount. The 362 spreads the pumping work load over more pumps. Seems easier.
Current production the Dragonfly can be woke up with a bit of porting and a shortened hammer spring. I plan on testing this theory soon myself.