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Advice Please On 2 Shots.

Discussion in 'Technical' started by ukzero1, Jun 27, 2020.

  1. ukzero1

    ukzero1 Busy Member

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    I have just done a monthly chrono check on my RM8. I put 10 sots through (combro Mk4) and the results were as expected at 11.4 to 11.6, that is except for 2 shots that went above 12 (12.4 and 12.5) :eek:. The pellets used are Hades (.22 15.89 grain). Can anyone explain why this should happen? It was shots number 3 and number 7 that went over, the rest, as said, were bang on what I was expecting. Any ideas because I'm stumped. :shrug:
     
    Redcap 114 likes this.
  2. allanthomas66

    allanthomas66 Heart Breaker & Life Taker...

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    Dodgy regulator possibly? That's a long way out of the normal string.
     
  3. uncle bulgaria

    uncle bulgaria Member

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    Did you weigh individual pellets or just use claimed weights?
     
  4. ukzero1

    ukzero1 Busy Member

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    Straight from a brand new tin, I don't have the gear to weigh pellets.
     
  5. ukzero1

    ukzero1 Busy Member

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    That was my first thought, but the other shots were bang on as expected. Now, if it was 2 shots one after the other, fair enough, dodgy regulator perhaps, but those 2 odd shots is making me think pellet problem maybe? I don't have the knowledge to pin it down.
     
    1260engineer and allanthomas66 like this.
  6. uncle bulgaria

    uncle bulgaria Member

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    Pellet weights DO vary in each tin so could produce higher fps (and subsequently a false high power reading?). However, such a high variance, as suggested above, could possibly point towards reg issues?
     
    ukzero1 likes this.
  7. ukzero1

    ukzero1 Busy Member

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    I do have a tin of AA DF's, I could try those and see what happens. Last month I chrono'd the RM8 using those and the readings were spot on with an average of 11.5. with the highest being 11.7. It just seems odd that using a different pellet gave the same readings except for those 2 oddballs.

    The Crombo Mk4 is calibrated and has new batteries. It's the only chrono I have so can't check it against another.
     
  8. ukzero1

    ukzero1 Busy Member

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    O.K. Just done another chrono using the AA DF's. 10 shots and not one over 11.7. :shrug:
     
  9. 1260engineer

    1260engineer Busy Member

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    watch the time between shots . give the reg a chance to settle . :) i ram shots through to see how quick the reg refreshes . then i run it again with about 10 seconds between shots :up:
     
    cloverleaf and ukzero1 like this.
  10. ukzero1

    ukzero1 Busy Member

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    So I could have shot too quickly? I would never have thought of that. I did take my time with the AA DF's as I was sighting a scope in at the same time. Thanks. :thumb:
     
  11. 1260engineer

    1260engineer Busy Member

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    I had this the other day
    20200625_205714_copy_784x1613.jpg
    can you see it look at the top numbers the look at the bottom then the middle . dident give it time . then today it was perfect while shooting . never rush regulators . times ive watched people run a string and just dive in . relax take your time watch the numbers . and try different pellets . when i was setting my valve i had lites making more power than heavys . :) keep a eye on things if it goes stupid there are plenty of good lads on here to help :thumb:
     
    BARNEY20 and ukzero1 like this.
  12. ukzero1

    ukzero1 Busy Member

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    Thanks for that. I had visions of it going to RFD and them keeping the gun. :thumb:
     
  13. jesim1

    jesim1 Kit bitch to the Stars

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    Any pellet going over 12fpe can get you in trouble, so at 12.5 I'd be investigating this further to make sure your ok. I would definitely get some weighed to make sure they are all the same weight, have someone send you a couple of dozen Hades weighed if need be, stick up a wanted ad and I'm sure someone will oblige for a couple of quid donation to the forum. It could be the reg as mentioned, but checking pellet weight is cheap, checking regs is not, but if your getting erratic figures your guns not going to be running at it's best anyway, so a service would not be a bad idea.
     
    Redcap 114 and ukzero1 like this.
  14. ukzero1

    ukzero1 Busy Member

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    I fully understand what you are saying and it does make sense. What doesn't make sense is that a second chrono test using AA FD's produced bang on results with the highest shot being 11.7. As @1260engineer explained, it could be that I was shooting the third and seventh shot too quickly when testing with the Hades and not giving time for the reg to settle. I'll phone my local RFD in the morning and see if he can fit it in for a service and hope the news is good.
    Thank you. :thumb:
     
  15. hughwp

    hughwp Busy Member

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    Spurious functioning of the Crombo ????
     
  16. 2506sendero

    2506sendero Legend in his own mind & living on the edge.

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    A 2 shot shift of 1fpe over a 10 shot string is unusually high and more likely to be a regulator issue than pellet weight irregularity IMO.
     
    Redcap 114, Gat Man and ukzero1 like this.
  17. ukzero1

    ukzero1 Busy Member

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    I'm not sure to be honest. I had changed the batteries and re calibrated the Combro before testing. Testing with the AA DF's produced a perfect string of 11.5 to 11.7 across 10 shots. So it doesn't make sense when I tried with the Hades and get 2 oddball shots.
     
  18. nevadacowboy

    nevadacowboy Posting Addict

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    How to test your reg.

    Fire 2 shots quickly.
    Fire 2 shots at 1 minute intervals.
    Fire 2 shots 2 minute intervals.
    Fire 2 shots quickly

    Noting all the chrono results.

    All of the shots should be very close to the same velocity over the different time intervals.

    If the first shot is faster than the other one in the first two shots this can indicate reg creep.
    If the shots get faster over the one and two minute intervals this can also indicate reg creep.
     
    phil.m, 2506sendero and ukzero1 like this.
  19. ukzero1

    ukzero1 Busy Member

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    Will do that, thanks for the advice. :thumb:
     
  20. Virak

    Virak Busy Member

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    A set of jewelry scales is less than £10 inc postage accuracy +/- 0.002grain - important you use on a very solid worktop, no sunlight, and no notable moving air ALWAYS close the lid over pellet.
     
    ukzero1 likes this.

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