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Chrono Accuracy/consistency

Discussion in 'Technical' started by ricardolamos, Oct 16, 2020 at 11:56 AM.

  1. ricardolamos

    ricardolamos Engaging Member

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    Given the potential implications of having a non-FAC airgun producing more than 12 ft.lbs.I have been wondering what other forum user’s experience of the accuracy and consistency of chrono’s?

    I have one of the cheap Chinese E Bay chrono’s which although I think is working OK I cannot verify.
    Even if one purchases an expensive chrono how can one be sure it operates accurately without regular validation?

    I would also be interested in people’s experience of how the 12 ft lb law is implemented.
    If a gun you owned was very marginally over the limit eg.12.1 ft lb but on your chrono showed an output of 11.9 ft lbs would you have your gun confiscated and be hauled off to prison even though you were under the impression you were abiding by the law?
     
    Twoplusfour1 likes this.
  2. Dag

    Dag Pro Poster

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    You would certainly be breaking the law if it was over the 12fpe limit. Perhaps it’s worth saying, for the benefit of anyone new to air gunning that running a rifle at 11.9 would be extremely foolhardy, in fact being within 0.5 of the limit would give me cause for concern.
    Prison? no. A fine? Highly likely
    HTH
    Jim
     
    Mr Bond likes this.
  3. ricardolamos

    ricardolamos Engaging Member

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    Thanks Jim
    I get your point but it appears many air guns are sold which are over 11.5 ft lb when new.
    Punters may be buying guns in good faith from dealers which they have no facility to test and which could open them up to a fine or more.
     
    Dag likes this.
  4. 1260engineer

    1260engineer Precision matters

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    This is why i aways run 2 chronos when setting up a rifle one sits on the end of the barrel and the other a foot away and i cross reference the two . its your responsibility to make sure your weapon is legal . if its not when you get it take it back . excuses don't wash with the bloke or woman in the wig :thumb:
     
  5. ricardolamos

    ricardolamos Engaging Member

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    So in essence you are saying that anybody who buys an airgun needs to have 2 chrono’s to be on the safe side.
     
    1260engineer likes this.
  6. Reefmonkey

    Reefmonkey Busy Member

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    I think if it went to court because your rifle was slightly over. You would get a slap on the wrist.
    Especially if your chrono was saying it was legal.
    All you can do is go by the chrono you have.
    You would have to be doing so something really stupid to get your rifles tested by police.
     
  7. 1260engineer

    1260engineer Precision matters

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    No mate its what I do . but you need a chrono just so you dont get caught out and its s handy tool to have :thumb:
     
    raven hunter likes this.
  8. hmangphilly

    hmangphilly Keyboard Hero

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    3 or 4 would be even better
     
  9. Brad75

    Brad75 Thebradsimps

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    So what happens if you're legal with one type of pellet and then use a heavier pellet for example?
     
  10. brk1

    brk1 Busy Member

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    If it becomes illegal again you've got to alter it again, it shouldn't be able to go FAC with any type of pellet you try, it's up to you to make sure of it as well , it's a sub 12 fpe air rifle , if it constantly fires one type of pellet over 12 fpe then it's a FAC, you need a slot on a firearms ticket for it . Very annoying on some rifles, one of mine goes silly on superdomes, so had to do a little bit of surgery on it :thumb:
     
    Mr Bond likes this.
  11. Dan Simpson

    Dan Simpson Busy Member

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    Do we have a factual number of cases prosecuted and proven above power?
    I know there's a couple, one in particular where it resulted in a fatality. But I just wonder how many say in the last 20 yrs...
     
    bucketboy likes this.
  12. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    It may or may not go over, the same can be said from heavy to light. No matter how many you test that stays under 12, there will always be pellets that will push it over.

    Set the power in the low 11’s with the most accurate, and be done with it:thumb:
     
    Brad75, Dag, Mr Bond and 1 other person like this.
  13. Brad75

    Brad75 Thebradsimps

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    In the JSB test pellet selection there are pellets ranging from 13.43 grns to 20 somthing. My rifle shoots the light ones all around 9.5 flb the mediums around 10.5 anything over 15.98grn it goes a bit nuts!!!
     

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