CO2 and LPA comparison .22:
The following are the results of five .22 caliber barrels tested with Low Pressure Air (LPA) and compared to the co2 tests previously done. This was first posted on the Crosman/Poorman Plinker facebook group.
Barrel..... 10.25 12.00 14.50 18.00 24.00
LPA SD... 32.00 34.00 38.00 38.00 22.00
LPA Avg.. 512.0 555.0 592.0 618.0 654.0
CO2 Avg.. 474.0 491.0 522.0 544.0 551.0
LPA-CO2. 38.00 64.00 70.00 74.00 103.0
LPA Inc /in 00.00 24.57 14.80 7.430 6.000
CO2 Inc/in 00.00 9.720 12.40 6.290 1.170
LPA V/in-
CO2 V/in... 3.710 5.330 4.830 4.110 4.290
8)
Nice work. So, what kind of shot count were you getting with the LPA and a 10.25" barrel @ 1K fill pressure before it dropped under 450 fps? Those numbers look pretty good for 10M shooting if you could get about 25-30 shots from a fill.
:( these were from an average of a 3 shot fill to approximate 900 psi and give a velocity drop range (SD). In a short tube like that it would either require a drop block or tethered tank to get any reasonable shot count. I intend to try upping the unregulated pressure, but that will require additional valve modifications. This test was done with factory valve settings. 8)