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Bsa Ultra Mmc .22 Shot Count

Discussion in 'Anything Airgun Related' started by willo1962, Mar 25, 2020 at 4:46 PM.

  1. willo1962

    willo1962 Busy Member

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    Seeing as I have some time on my hands I did a shot count on my Ultra with a fill of 180 bar down to 70 bar. I got 55 usable shots and stopped shooting at 59 shots.
    I only use my Ultra for paper punching so I am not too worried that it is shooting just over 9 FPE but would like it just over 10. I may be brave and try a service on it. I recently fitted a Huma pressure gauge and quick fill and have stripped my SMK 78 many times
    shots hi-lo deviation
    1-10 542.5 - 536.9 5.7
    11-20 542.7 - 531.3 11.4
    21-30 535.6 - 531.3 8.4
    31-40 526.0 - 511.8 14.2
    41-50 512.4 - 488.0 24.4
    51-56 504.6 - 467.9 36.7
    This equates to hi 542.7 @ 9.38 FPE lo 467.9 @ 6.9 FPE
    This is my target shot at 18m. First few shots to zero

    IMG_20200325_164407.jpg
     
    Last edited: Mar 25, 2020 at 4:53 PM
    talent, Dave A Smith, Tim_B and 2 others like this.
  2. Deejayuu

    Deejayuu Donator

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    Show the rifle please. :)
     
    willo1962 likes this.
  3. willo1962

    willo1962 Busy Member

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    IMG_20200325_213708.jpg IMG_20200325_213752.jpg
     
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  4. Deejayuu

    Deejayuu Donator

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    Thanks. Hoping it was single shot. Just got one without gauge and showing age a little but works well.
    Wondered what MMC means
     
  5. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Micro Movement Cocking:)
     
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  6. Deejayuu

    Deejayuu Donator

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    Thanks but no wiser :)
     
  7. Howlin Wolf

    Howlin Wolf Busy Member

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    Give me a shout if you need to mate.
    A lot easier than when we did the seals on your 78! :facepalm:
     
    willo1962 likes this.
  8. bhodge

    bhodge Posting Addict

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    MMC is a device fitted to the earlier Ultra rifles. It's a plunger located at the front of the stock & below the air cylinder. The rifle can be cocked by depressing the plunger, it can be done with a short movement of one finger, hence the micro movement definition.
     
  9. willo1962

    willo1962 Busy Member

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    that would be great when we get back to normal. Had the 78 apart many times now.:thumb:
     
    Howlin Wolf likes this.
  10. louisvanhovell

    louisvanhovell Busy Member

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    Nice post thank you. With time on my hands I am doing shot strings of my airguns.
    My Ultra. 22 mmc was the first one to take the test.
    60 good shots at 11.5-10.3 ft/lbs on a 220 mm cylinder at about 220 bar using 15.89 gr JSB.
    I bought the action from John Bowkett. He put it together using parts he found in the bin of the BSA factory lol.
    I believe the secret of the efficiency is his valve setup.
    The hammer spring, valve return spring, tp, barrel length are balanced.
    As a result it's also quiet.
    Anyway. In order to up the power, you can increase hammer spring tension. You will lose efficiency and shot count.
    One footpound extra costs a lot of air. On some Ultra's it is easy but I believe writing about upping the power is a no-no on here :D.
    If I were you, I would just enjoy this great setup, sounds perfect. The times I've tried to "improve" things only to end up with headaches and the wish I had never started and just been happy with the way it was :facepalm:

    [​IMG]
     
    Last edited: Mar 26, 2020 at 5:43 AM
  11. secretagentmole

    secretagentmole Low down, dirty and quiet...

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    It means a lie...

    A lie.
     
    willo1962, Kalibrgun and Deejayuu like this.
  12. willo1962

    willo1962 Busy Member

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    It does seem a bit of a faff. Cocking my SMK 78 is so much easier and easy to de cock. I do love how compact and accurate the ultra is. If I had really tried I could have put every shot inside one of those 1/4 inch bulls so probably just a service soon as the mate I bought it from had it from new and it has never been touched
     
    Howlin Wolf likes this.
  13. Howlin Wolf

    Howlin Wolf Busy Member

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    If yours is anything like mine, there'll be no problem doing that.
    Happy to video or phone call mate if you want to have a crack at it!
    It's straightforward mate.
     
    willo1962 likes this.
  14. secretagentmole

    secretagentmole Low down, dirty and quiet...

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    The Ultra MMC is an example of a good idea led into an alert and the crap kicked out of it by a committee. I know it is a Bowkett design, but it is still crap.

    The cocking mechanism is not a micro movement and I know what happened to all the bloody suspension springs for Rover 25s when Longbridge went under. BSA knicked them and used them on the Ultra MMC cocking mechanism. It really is a spitefully hateful gun. I know I owned a brand new one for two weeks.

    It was accurate but I hated it, if you can't tell...
     
    willo1962 likes this.
  15. Makis

    Makis Member

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    My 12year old MMC .22 Ultra has a Tench reg., i get 75 good shots before it starts to drop off from 200 bar fill. The MMC takes a bit of getting used to but after a while the fingers on the cocking hand will look like Arnie's thighs and it becomes a doddle to cock it.
    Regards, Makis
     
  16. willo1962

    willo1962 Busy Member

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    I was thinking of getting a reg but I have already bought a Huma pressure gauge that had been reduced to 40 euro, a new 6.8l bottle (£100) as my carbon bottle was over 15 yrs old and a new bl4de silencer. I did pick the rifle up for next to nothing but you have to ask yourself can you justify the price of a reg for a few extra shots when I get about 50 shots from 180 bar with only about 1mm POI change across the fill.
    Going to give it a service soon and may just turn up the power to 10 FPE. Even with the gauge fitted and a reg if I got one I would be lucky to get £200.
    I only have the Ultra as a friend in work gave it to me for some lifts to work
     
  17. Makis

    Makis Member

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    Hi willo, if you're not bothered about it then you would be better off to sell it as is, don't spend all that money for no return, but i would like to add with the power up near the legal limit and a reg. fitted you will get more accurate shots per fill and velocity of 5 fps variation or less making it much more consistent. No need for a bottle, get a pump and DIY ! I'm 75, have a heart and breathing problem, take it steady and you can do it. A home tune will make it better as well. I wish you luck!
    My regards, Makis
     
    willo1962 likes this.
  18. willo1962

    willo1962 Busy Member

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    Well I stripped it down but its not the same as the one in the XTX guide. Mine did not have an anti tamper device and the end cap did not have an adjuster so looks like I will stick at 9.5 fpe for the moment :D
     
  19. Makis

    Makis Member

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    How can i contact you? i can let you know how to do it.
    Regards, Makis
     
  20. willo1962

    willo1962 Busy Member

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    you could write a little guide or do an audio guide. I am surprised there is no youtube guide for my model. I think it must be a very early model.
     

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