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Advice Chrono advice

Discussion in 'Anything Airgun Related' started by pauljm116, Mar 4, 2012.

  1. pauljm116

    pauljm116 Engaging Member

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    I got myself a combro chronoscope to check the power of my rifle as it had been in storage for 10 years and wanted to see if it might need a service, its an air arms tx200hc. I fixed the chrono to the barrel and set pellet weight and then fired it into the ground, I was a bit shocked when it came back at just over 13 lbs (on 3 tests)as the legal limit is 12 and the rifle is as it was when I bought it Im now wondering what to do.

    Is there a chance that firing the rifle downwards makes a difference (gravity?) and should I retest firing normally?

    If it is an accurate test whats the best course of action - apply for fac (possibly tricky as I already own the rifle) or take it to a gun shop and have it tuned down?

    Wish I hadnt tested it now as whichever route I go down is going to cost and be hassle, any advice you can offer me will be very welcome.
     
  2. toytown

    toytown Honorary Member

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    it can do, what pellet weight is it.
     
  3. Barcelona68

    Barcelona68 Banned BANNED

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    Try firing it up into the sky...
     
  4. pauljm116

    pauljm116 Engaging Member

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    16 grains, theyre the only pellets Ive got at the moment.
     
  5. Wayupnorth

    Wayupnorth Honorary Member

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    Try it shooting straight to see if it makes a difference. If your rifle is still over, don't apply for an FAC as you aren't supposed to have a rifle over 12ft/lb until AFTER it has been granted. Taking it to the shop is ok, but they will have you by the short and curly's as they know that they can confiscate the rifle, or make you pay any figure they decide to pull out of the air to fix it for you.
    If it is over power, I would strip it down and check that there are no preload washers inside the piston. If there is, remove them. If not, you will have to shorten the spring, or buy a new spring. Firstly though, don't be afraid of stripping the gun down. It is a doddle of a gun to strip. Take care when removing the block from the back though, as if the spring has more preload than you can manage, you could be injured. A spring compressor is ideal. Failing that, an overweight mate and a towel has the same effect, though probably best not to tell him why you need his help).
    To shorten the spring, you have two options; the first is the easiest and involves holding one end of the spring over a flame until cherry red. While still red, using a pair of needle-nose pliers, compress it to remove the space between the end coil and the one below it. You need to make it flat agian so that it will stand up on both ends without doing a 'leaning tower of piza' trick.
    If you have to compress more than one coil, I would recommend option two.
    Option two is to literally cut a couple of coils off with a dremel or similar. Then using option one to flatten the pointy end to look the same as the other end. Finally, polish any burrs off using a dremel and test the power again.

    This all sounds far more complicated than it really is. I no longer have my TX, so I can't take pics to show you how to strip. Hopefully, somebody will step up and do this if you get stuck.
     
    Last edited: Mar 4, 2012
  6. pauljm116

    pauljm116 Engaging Member

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    Location:
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    Cheers for the advice Marco, left my rifle at a mates yesterday so will have to wait till saturday to test it again. If its still over power I'll look at following your advice and get it back to legal levels.
     
  7. Steve K

    Steve K Posting Addict

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    The gun barrel should really be level when doing chrono tests, and make sure the batteries are good as if they're not, this can give false readings ;)
     
  8. pauljm116

    pauljm116 Engaging Member

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    That might make it under power, so may give it a try. ;)
     

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