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Carrying Power

Discussion in 'Anything Airgun Related' started by Kevg88, Nov 21, 2020 at 10:21 PM.

  1. Kevg88

    Kevg88 Engaging Member

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    So I've just got an FX impact stx .22 barrel.
    With my .177 barrel in I'm getting 11.6 ftlbs,
    Just put the .22 barrel in and without adjusting anything I'm getting 10.5 ft lb with an 8 FPS spread over 28 shots, happy days.

    I thought about it and was tempted to adjust closer to the limit, the thing that put me off was the fact if I swap back to .177 again id be over the limit.
    Crunched the details in chairgun and at 40 yards the .177 is at 7.2ft lb's
    What surprised me was the .22 is still carrying 7 ft lb's.
    So that made the decision for me no tinkering needed!

    Anyway not really a question just never quite realised how much power the .22 carries!
     
    Nuggett, keithy, Geordiedan and 4 others like this.
  2. Geordiedan

    Geordiedan Engaging Member

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    Interesting result and not what I’d have expected - typically .177 being less efficient needs more air to make power, you you’d see .22 being higher after a barrel swap with a PCP

    Perhaps the valve is open sufficiently quickly in yours that the pulse of air is snappier and favours the smaller pellet. What weights were you using in each cal?

    Good result though and means minimal faff when doing barrel swaps :thumb:
     
    Nords and TORNADOS7 like this.
  3. Jimmypie

    Jimmypie AGF Leshiy rehoming service

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  4. Kevg88

    Kevg88 Engaging Member

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    Aii me too! I think as the transfer port and pellet probe are changed aswell it must Restrict the amount of air a bit more :-D definitely happy with it though haha!
    In .177 I'm using AA fields 8.4grn BC 0.021
    In .22 in using jsb Hades 15.89grn BC 0.023
     
    Jukebox, cloverleaf and Geordiedan like this.
  5. Kevg88

    Kevg88 Engaging Member

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    Jimmypie likes this.
  6. Geordiedan

    Geordiedan Engaging Member

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    Transfer port will explain it most likely :thumb::cool:
     
  7. Kevg88

    Kevg88 Engaging Member

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    Cracking bit of kit like
     
    Geordiedan likes this.
  8. robs5230

    robs5230 You don't need a sledgehammer, to crack a nut

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    As said above, its odd that a change from .177 to .22 doesn't result in a power increase.

    Its down to setup.
    You should need far less air per shot in .22 so at current settings in .22 you're wasting air. Not a problem if it isn't important to you
    I'd have a word with @Jeffsky though

    Be careful of an off reg spike too
     
    Geordiedan likes this.
  9. Kevg88

    Kevg88 Engaging Member

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    Aii I think it's just down to the transfer port being different I'll keep an eye on it and see if anything changes after a few hundred shots!
     
  10. Jeffsky

    Jeffsky Posting Addict

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    On the impact as you say the TP is the restriction on the 177 it has a 3.2 and the .22 is 2 mm from memory with a bit of mucking about you can get them to be a straight swap with almost no power change
     
    robs5230, 32:1 and talent like this.
  11. Lev Levvin

    Lev Levvin BEAST OF BODMIN

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    :facepalm: Power.....o_O :rolleyes:

    I would be more interested in the pellet speed... not ‘power’.... to tune my rifle... unless it’s simply legalities you’re worried about

    and obviously the consistent accuracy of your chosen projectile at a given speed :thumb:
     
    Jeffsky likes this.
  12. Kevg88

    Kevg88 Engaging Member

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    Hi Jeff in .22 546 FPS average over 28 shots with a low to high spread of 8 FPS :)

    In .177 it's 786 FPS over 38 shots average with a 12 FPS spread :)
     
    Jeffsky likes this.
  13. Kevg88

    Kevg88 Engaging Member

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    And as accurate as it should be
     
    Jeffsky likes this.
  14. Jeffsky

    Jeffsky Posting Addict

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    That's pretty good mate, and if it's accurate your good :thumb: what i do when i am balancing a 2 barrel setup i would open the .22 TP up a little and get the power as close as i can to the .177 power so they are both running at mid 11's then you can use the power wheel to adjust the pellet speed to get the best accuracy with no worry's about going over 12:thumb:
     
    32:1 and Kevg88 like this.
  15. Kevg88

    Kevg88 Engaging Member

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    Ahh that's a good shout never thought of that, Love this forum haha!
     
    Jeffsky likes this.
  16. Kevg88

    Kevg88 Engaging Member

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    Might get a spare and have a go :)
     
    Jeffsky likes this.
  17. Jeffsky

    Jeffsky Posting Addict

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    That is the beauty of the FX setup you can get the power up on both barrels and use the power wheel to get the pellet speed you want very quickly when changing calibre with no fear of going over 12 ftlb :D
     
    Lev Levvin and 32:1 like this.
  18. Jeffsky

    Jeffsky Posting Addict

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    Just go up very slowly with the hole size :thumb: it doesn't take much :D
     
  19. 32:1

    32:1 Theoben, Kalibrgun and ‘cough’ FX user

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    My crown in .177 guise is 11.2 and a quick calibre change to .25 gets me 11.6 with no tweaks, @Jeffsky has worked on both barrels and shortening the .177

    My next experiment will be dropping the .25 power with the wheel to as low as possible and see if we lose any accuracy

    Chris
     
    Kevg88 and Jeffsky like this.
  20. Kevg88

    Kevg88 Engaging Member

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    Cheers haha! I'll have an un tampered one on standby, thanks for your help!
     
    Jeffsky likes this.

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