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Pellet weighing

Discussion in 'Anything Airgun Related' started by Bemused, May 21, 2014.

  1. Bemused

    Bemused Engaging Member

    Messages:
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    Location:
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    Just out of intrest how important is pellet weighing.

    I just weighed a random sample of JSB Exact 4.52mm 8.44gr 0.547g

    1. 0.540
    2. 0.542
    3. 0.544
    4. 0.546
    5. 0.546
    6. 0.556
    7. 0.548
    8. 0.554
    9. 0.542
    10. 0.540

    OK its a small sample and in grams.
    I weighed each one 5 times to prove my scale, the scale agreed to 0.002g, its minimum resolution. Its not a pellet scale if there is such a thing.
    Any comments, who weighs and sorts and how?

    Regards
    Tony
     
  2. Ganton Gunner

    Ganton Gunner Super Duper Moderator Staff Member Mod/Admin

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    ive never weighed pellets in my life or washed them either but I can still cloverleaf all day long at 35 yard not sure I could get much better
     
  3. jesim1

    jesim1 Kit bitch to the Stars

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    Hi Tony

    Be careful, you are getting too close to the light when you start weighing pellets:eek:

    Had a quick play with Chairgun and converted your figures back to grains via a converter.

    The upshot is:

    Your lowest figure is 8.33grains, which at 11.5ftlb is 789fps.

    Your highest figure is 8.58grains, which at 11.5ftlb is 777fps.

    The AA quoted figure is 8.44grains, which at 11.5ftlb is 783fps - right between you two high/low examples.

    This only makes a maximum difference of around 2 to 3 mm at 40meters in perfect conditions.

    So in conclusion, if you are a serious competition shooter you will do everything possible to give consistency to your shots, and therefor weigh and wash your pellets. If your like me and think your doing well by hitting the target in the first place, gaining a potential 2mm at 40m is not worth it, I'd do better concentrating on practice and positioning.

    You now have the info........................it's up to you if you think it's worth the trouble?

    James
     
  4. terry1001

    terry1001 Major Poster

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    I did weigh some Air Arms Field in 0.177 as I wanted to check consistency before doing a shot string. I had about half a tin of the batch I had been using and sorted them out to the nearest 0.1 grain and found quite a variation. As I didn't have enough of any one weight to do a full string I opened another tin which was from a different batch. When I had finished I found weoghts from 8.1 gn to 8.9 gn which is a considerable difference. The second tin was about 0.2 gn heavier thaan the first. About 2/3 of the pellets were either 8.4 gn or 8.5 gn so quite close to the nominal weight of 8.44gn but with some significant variation.
    Although there were only a few pellets at the extreme weights they could still result in changes to the point of impact. Almost none of the pellets showed any signs of damage. So far I've not had an opportunity to check the poi of the different weights as this would need perfect conditions and I've not been able to get access to an indoor 35 yard range recently.
     
  5. oliver13

    oliver13 Donator

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    I used to weigh pellets, but I gave up bothering as I couldn't see any real difference between the batches.
    Recently someone with Chairgun kindly worked out for me that a 3 grain difference 14.3 - 14.6 grains, translated to about 15mm at 50M. As I'm hunting & not chasing one hole groups at extreme ranges, now I don't weigh pellets & I don't worry about it either.
     
  6. Clubshot

    Clubshot Clubshot

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    Location:
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    Most Wasted Design Pellets are made on Multi Head Dies - So in a Tin you could have a very good variation

    In most cases most will still give good results -

    Weighing is bad - putting them through was resizing Die is a Worry -

    BOB/R
     
  7. stevemandm

    stevemandm Honorary Member

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    in a distant galaxy, far far away ....... actually
    the only time i weigh a pellet, is when i'm chronoing the rifle - that way, my figures are exact, with minimum error.
    i'm not a good enough shot to benefit from weighing/sorting the pellets for use, but in theory, sorted pellets will make a difference to accuracy if your rifle is consistant. how much tho, is debatable
     
  8. Bemused

    Bemused Engaging Member

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    Thanks all, your comments are appreciated.

    James, thanks for taking the trouble to stick the numbers into chairgun.
    I only shoot for fun but have a lot of fun shooting 6mm bkanks at 35 yards, this i am not so successful at. Best yet is 18 shots to bag all ten blanks in the Gr8fun bottle bank but on occasion I get far worse results. Maybe weight variations ratify my results.

    Secondary zero at 15 yards is one shot one bang, no challange and quite boring.

    The sample weights were just ten random pellets from a tin so I expect a little more deviation out of a full 500 so one rainy day I may just weigh a whole tin in order to find out just what the standard deviation is. Armed with an SD I may then just sort 50 best weights bang in the middle of the SD and use them for zeroing and use them for taking to church on Sundays.

    Regards
    Tony
     
  9. Accuspell

    Accuspell Pro Poster

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    For testing pellet weights in a tin I take a random selection of 50 pellets, some from the top when I open the tin, then take a load out and get another batch from the middle, then another lot from the bottom - then get the rest from the ones I have taken out. Weigh those 50 to get a good idea of the spread of weights.
     
  10. Bemused

    Bemused Engaging Member

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    Thanks
     

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