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BSA Ultrion (?) shot string findings

Discussion in 'Anything Airgun Related' started by Tinbum, Jun 18, 2014.

  1. Tinbum

    Tinbum Delusions of adequacy

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    I've just fired a shot string over the chrono with my BSA "Ultrion" project gun. Its basically a single shot MMC Ultra with a Scorpion air tube. The gun was filled to only 190 bar as opposed to the recommended 232 bar as a) it saves the useless shots on the up curve and b) my bottle needs filling!:cool:

    I was using AA field 8.4grn pellets and an F1 chrony.

    The first 8 shots were consistently around 10fpe before rising to 10.5 over the next 7. My "useful" shots are from here, peaking at 11.4fpe and returning to 10.5 46 shots later!!:eek: Forget fps, fpe and all that jazz, that's 46 shots that will all hit within 1/4" at 50 yards if zero'd at 35 yards!! From an Ultra!!
    If we push the envelope and include all the shots that will hit within 1/2" at 50, then its a rather impressive 64 shots! Remember, that's from just 190 bar.

    The gun is every bit as pointy as standard, if anything the little bit of extra weight out front helps stability. If you have an ultra and want more shots, buy a scorpion tube!;)
     
  2. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    I had a scorpion cylinder on mine for a bit, for me it was to front heavy.

    Regulated, I was getting 107 at 11.3 in .22

    looked good though:)
     
    Last edited: Jun 18, 2014
  3. Tinbum

    Tinbum Delusions of adequacy

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    A reg would be the next thing on my list. I fitted a Robert Lane one to an FX last year. Very easy and great results!
     
  4. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    It really has been the best addition to my ultra, even with the standard cylinder, I still get 80 usable shots per charge!

    and no power curve:)
     
  5. rkr

    rkr Keyboard Hero

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    There's also the 425mm long rifle cylinder that can be used. It's a perfect fit for 12" barrel and 200mm long silencer.
     
  6. vitalich

    vitalich Keyboard Hero

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    if you waste first 20-30 shots after lubing/servicing the gun - is ok as the oil dropps from the valve unit and other stuff spreads around,
    so i usually do two mags out before to refill and chrone

    60+ shots on .177 is a good try, how many of them was on flat around 11+ fpe?

    with scorpion cyl, if u add regulator and decrease workind pressure down to 50-60 bars, think you can reach up to 120++ shots easily, or about 100+ with 80-90 bars wp
     
  7. vitalich

    vitalich Keyboard Hero

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    and think the look of your gun will benefit from the full barrel shroud silencer

    View attachment 98597
     
  8. Tinbum

    Tinbum Delusions of adequacy

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    From 10.9-11.4 (0.5fpe) there were 38 shots!
     
  9. vitalich

    vitalich Keyboard Hero

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    very good result for unregged bsa :)

    keep us updated on your project
     
  10. Tinbum

    Tinbum Delusions of adequacy

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    I had a few spare minutes, so I made a better looking mod. It reflexes back 2 1/2" over the barrel and has a larger expansion chamber and plenum insert. While its still not as quiet as the HW, its a lot shorter and does what I need it to.

    I also did a ten shot group at 35 yards. Shame about the flyer........:eek:
     

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