Okay the O-rings repair kit arrived from Huma and the sear, etc. from Fox Air!First string fill at 3200psi I use for Notos as wellChallenger 30 Huma 58gr 11 655 10 651 9 845 91.958 821 86.87 806 83.666 791 80.575 769 76.154 762 74.773 725 67.692 706 64.191 695 62.2ES=150 SD=49 9 60+fpe shots, was expecting a tighter spreadI then shot a 27 shot string by filling to 3800psi; ES=251 and SD=81 with a peak 843fps and 91.51fpe at shot 21. From dropping below the reg I started at 592fps and 45.13fpe and climbed. Sadly The tube gauge seals but does not display an accurate reading....I'm thinking a 3500psi fill might be the sweet spot and staying above the reg...Then I ran out of 58gr slugs so tested the 49gr ApollosFIlled to 3800psi and got a 35 shot string which peaked at shot 30 901fps and 88.32fpe ES=241 and SD=79Gonna see if the spreads tighten up at 3500psi and with some regulator "break-in."Also didn't test the NSA 47s yet...
I was thinking the es would be tighter with the regulator.
Do you know how many cc's of air you have in the plenum? The tube on the challenger is larger than the marauder and the marauders run 14 cc's per inch.