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  1. S

    FX PCP Airgun Tuning - Why would the FPS go down when increasing the Hammer Spring at a constant reg pressure.

    As this is .25, Higher power (FAC) and Im looking to get heavies and slugs as fast as I can manage with the stock system, I set the HST Maximum to be as high as it would go at the “MAX” on the Dial. As an aside - I do see that the back end of the shuttle is accessible from outwith the gun and...
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    FX PCP Airgun Tuning - Why would the FPS go down when increasing the Hammer Spring at a constant reg pressure.

    Hi All, Thanks for all your help, explanations and well humoured ridicule. I am more of a lurker than a poster, and I am a bit further down the 10 000 pellets than most may think. Personally I dont think I was doing anything “stupid” well not in the sense it is used above. I am experimenting...
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    FX PCP Airgun Tuning - Why would the FPS go down when increasing the Hammer Spring at a constant reg pressure.

    Hi All again, Thanks for the Replies - @manabeknives cheers for the link Ive watched that, and Steves 3 others including the one for the Impact and the other for the continuum. I watched Matt Dubbers, and about 6 more from many others too, including Whisky 68 and the boys from Utah, Ted - and...
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    FX PCP Airgun Tuning - Why would the FPS go down when increasing the Hammer Spring at a constant reg pressure.

    Hi All I have a very early FX Crown (in the first 500 made) It has the 8mm reg piston - I only mention that to date it. Now I have been out of shooting it for a while and it used to be an good gun and Shot JSB King Heavy MKII’s best at about 800fps and 120bar reg, this was how it came from the...