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Advice on using a chrono please/BSA Mercury,Challenger

Discussion in 'Anything Airgun Related' started by Deejayuu, Apr 21, 2014.

  1. Deejayuu

    Deejayuu Donator

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    'Cos I love tampering I got a 625 Chrono and used it a few times just checking fps as indication of performance.
    Yesterday I tried it on a .22 Chinese chunk after fitting a home made cup washer. Six results 650 to 710 so quite pleased.
    Next thought I'd try a Challenger which needs some TLC to give before and after figures.
    First two gave "bad" display third chipped top edge of furthest guide fourth took a bigger lump out so stopped at that.
    Set the chrono up same way on both muzzles using a snug sliding fit guide rod in the barrel to centre.

    Afraid of trying again in case I've missed the obvious. The Mercury barrel is socketed so not easy to see the crown but seems to be OK.

    Anatomically possible medically approved suggestions appreciated
     
  2. mark112

    mark112 Engaging Member

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    Hi,

    Only advice I can give is to be very carefull using one on a springer/gasram. I say this from experience. I now hold the end of the barrel (obviously not over the bore!) now if chronoing and this seems to stop me shooting bits off my combro.

    Mark
     
  3. Deejayuu

    Deejayuu Donator

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    Thanks Mark I think you've pinged it. Among TLC tasks on the Challenger is sloppy breech/side play in the jaws. Probably flapping about under recoil/shock.Regards, Jules.
     
  4. Dag

    Dag Pro Poster

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    Is your Chinese Chunk an FAC rated rifle then? Probably talking out of my proverbial but just put 710fps on a .22 of relatively light weight ie 13.8gn into Chairgun and got a power level 15.45ftlbs!
    Dag
     
  5. terry1001

    terry1001 Major Poster

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    I only use my Combro on pcp rifles and always fix it with several turns of insulating tape, pulled tight. This seems to be the most reliable way to fit it to the barrel/silencer as it stops all movement. I did try elastic bands and cable ties but they were nowhere near as good.
     
  6. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Only use mine on pcps, got mine permenatly taped to an old silencer!

    couldnt get to work very well on springers though:)
     
  7. Patrick

    Patrick Donator

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    When I bought my Combro I bought the alignment tool as well for the sake of a couple of extra quid,works a treat.The only way I found to use it on a springer was to fix the mounting bracket securely to the barrel then cock and load and close the rifle then attach the unit while the rifle is resting on something stable and pointing in a safe direction,fingers away from the muzzle! If you mount the unit then cock the rifle it will fly off when you close the breech if it has a stiff or strong lock up.the casing breaks where it fixes to the bracket
     
  8. Deejayuu

    Deejayuu Donator

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    Thanks to all for comments
     
  9. Dag

    Dag Pro Poster

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    you're welcome but did you have any thoughts about the possibility of the rifle being over FAC level?
    Dag
     
  10. Deejayuu

    Deejayuu Donator

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    Dag, went back to the Chunk to see if the chrono still works. The reading dropped to 540/50 after a few shots so probably diesel problem?
    Started on the Mercury again now. Thanks.
     

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