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tuning shot string.

Created: 01/19/16 05:14 PMDescription: 18.1 5.25 turns 2600Notes 1: Notes 2: Distance to Chrono(FT): 1.00Ballistic Coefficient: 1.000Bullet Weight(gr): 0.00Temp: 62 °FBP: 30.04 inHg# FPS FT-LBS PF23 566 0.00 0.00 22 570 0.00 0.00 21 570 0.00 0.00 20 587 0.00 0.00 19 561 0.00 0.00 18 575 0.00 0.00 17 586 0.00 0.00 16 569 0.00 0.00 15 584 0.00 0.00 14 584 0.00 0.00 13 577 0.00 0.00 12 588 0.00 0.00 11 577 0.00 0.00 10 568 0.00 0.00 9 583 0.00 0.00 8 580 0.00 0.00 7 578 0.00 0.00 6 573 0.00 0.00 5 578 0.00 0.00 4 567 0.00 0.00 3 577 0.00 0.00 2 560 0.00 0.00 1 562 0.00 0.00 Average: 574.8 FPSSD: 8.5 FPSMin: 560 FPSMax: 588 FPSSpread: 28 FPSShot/sec: 0.1True MV: 575 FPSGroup Size (in): 0.00 What do I do to make this shot string better?
 
First, what gun? If it's a Marauder, what does the #5.25 refer to?
If I recall, for Marauders HS is Hammer spring tension, HT is hammer throw, and VST is the velocity screw adjustment. Without knowing each of these values no one can advise you. If that's a Marauder you should be getting either more power or more shots at that fill pressure IMO.
Just for example my .22 Marauder gets 30 good shots on a 2100 psi fill from 730 to 745 and down to 725fps with JSB 18.1s. Check out the Marauder Forum, it'll make your head spin with the possibilities!
http://www.marauderairrifle.com/forum/index.php?sid=059f35c84954bdee9515d8dfb7d8f002
John