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Question Variation in fps over 10 shots

Discussion in 'Anything Airgun Related' started by andyh, Jun 30, 2008.

  1. andyh

    andyh Engaging Member

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    What do you consider to be an acceptable fluctuation in fps over a string of 10 shots ?
    My (father-in-laws) HW80 has varied by 18.4fps over a 10 shot string, acceptable I think. 660.1 - 678.5fps
    Another rifle, a friends PCP has varied by as much as 39fps over a 10 shot string. 751.9 - 790.9fps

    What do you guys think ?:confused:
     
  2. a1gunner

    a1gunner Pro Poster

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    i dont work in ftps but id say 0.3-0.5 ftlbs mayby:confused:
     
  3. Buzz

    Buzz Banned

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    A1..0.3 ft/lbs is only equivalent to 10 fps on a 8.64 grain pellet...790 is just legal.....780 is 0.3 less.
     
  4. a1gunner

    a1gunner Pro Poster

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    math not my strong point:eek:

    i really dont know very much about figures.
    the quaestion was what we thought was an acceptible flux:confused:

    so thats what i though:confused:

    as long as the pellet hits the same place im happy:)
     
  5. Buzz

    Buzz Banned

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    There are so many factors that would change the FPS that only by eliminating all the pellet variables could you possibly know how well the actual gun performance was. Pellet weight is the most obvious one, pellet size tolerances is another, pellet cleanliness and pellet hardness, all will have an very real influence on the speed of the pellet at the muzzle. So, it follows that if you use a very good set of pellets you'll get much better figures than if you use ones which vary a lot, assuming that the gun is pretty consistant. This is another reason why better groupings can be obtained using a better quality, more uniform pellet. I would have thought with a bad make of pellet, 50 ft/sec variation could easily be expected, whereas with a very good quality pellet (and gun), less than 10 should be achievable. Matched pellets in a quality gun should be in single figures.
     
    Last edited: Jun 30, 2008
  6. Andy

    Andy Administrative Staff Member Founder

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    As Buzz said above, my Airwolf runs at 6fps variation with AA Field, but when i tried Defiants i am getting up to 30fps must be something to do with the split skirts maybe. :confused:
     
  7. andyh

    andyh Engaging Member

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    I should have said the HW80 is .22 using Crosman Accupells
    the pcp is .177 using Gamo Match.
    I need to do more maths to give the variation in ftlb maybe.
    Thanks for your replies, I just had to test my new chrono (shooting chrony F-1 which should have been an Alpha so it's been sent back for return) yesterday which was my birthday pressie and I was surprised at the initial variations.
    I'll add more info from the strings tomorrow which will give a clearer picture.
     
  8. EX Mod Cog

    EX Mod Cog Keyboard Hero

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    Clearly!

    I'd say anything up to 15-20 fps is acceptable, no airgun will be the same every time :up: they don't usually put out what it says in the manual anyway, it's usually a bit lower.
     

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