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Question Maybe a dumb one

Discussion in 'Anything Airgun Related' started by ste, Dec 29, 2013.

  1. ste

    ste Posting Addict

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    Has any one tested the pellet speed at 30 yards
    ste
     
  2. audiguypaul

    audiguypaul Donator

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    I think chairgun or Hawke BRC will calculate this info once you have entered the necessary info

    HTH Paul
     
  3. ste

    ste Posting Addict

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    Yes I understand that but has anyone ever proven it correct
     
  4. chrisfrain

    chrisfrain Engaging Member

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    I thought that a chrono measured speed? Some one should shoot through one at said distance
     
  5. Alan17hmr

    Alan17hmr Donator

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    Hello
    i know where your coming from

    But if I had Hawkes or Chairguns resources I think they would have carried out adequate checks indoors to protect there reputations

    I have used drop charts for lots of calibres and can only dream attaining the standards they set

    Alan xxx
     
  6. ste

    ste Posting Addict

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    Bang on that's what I was trying to say
     
  7. ste

    ste Posting Addict

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    Yer ok mate

    think of it like this Jo blogs wants to start hunting and if we new at say dead on 11ft lbs give you aprox 5ft lbs at 25 yards then we know that we need our guns to be at or above said ft lbs for hunting
     
  8. Jfrwhite

    Jfrwhite Posting Addict

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    If you wanted exact figures, each individual would have to test their own rifle(s) with each individual pellet. So although as you say has anyone proven chairgun etc figures, it would probably differ slightly for rifle to rifle and even individual pellet to pellet.
     
  9. Dunkman

    Dunkman Posting Addict

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    11.75 f/lb HW97k @ 30 yds = 425 fps & 5.8 f/lbs
     
  10. JD

    JD Donator

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    I did read somewhere ? that pellet speed at distance had been measured, you'd need a F1 type chrono to do it though,
    remember to protect the LCD display.
    If you try it though, a pcp or well behaved springer would be to rifle to use. ; )
     
  11. kel85

    kel85 Engaging Member

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    Isn't there a video on this site recently. That does all that. Shooting through a chrono at set distances?
     
  12. ste

    ste Posting Addict

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    So this would say that if a rifle was set at 10ft lbs then at 30 yards it would be a good hunter due to the impact ft lbs
     
  13. JD

    JD Donator

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    Did you do this test yourself Dunkman, if so,
    what pellet did you use ?
     
  14. darklord

    darklord Can’t beat a tx200 at 30m

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    why ? its not relevant as its muzzle velocity and kinetic energy at the muzzle is all thats important to stay legal. How ever in the eighties all pellet tests in the mags did comparisons at muzzle, 5 to 30 yards generally.

    but chronos werent as plentiful then and very expensive.
     
  15. OzzyJ

    OzzyJ Donator

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    It has been measured many times as this is the way you can check the ballistic coefficient of a pellet. You shoot it through and pair of chronos and then use the two speeds and the distance travelled to verify BC
     
  16. ste

    ste Posting Addict

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    Reason I ask:
    i would like to know what ft lbs a pellet hits a target and it's us full for all of us hunters as we can determine what power our rifles need to be at a minimum to prevent injury to quarry
     
  17. Meteor62

    Meteor62 Major Poster

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    Chronos were readily available and affordable in the 80's I was a doleite and managed to afford a skan mk4 with no big dent in my giro.
     
  18. simonc_here

    simonc_here Engaging Member

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    Vermin hunters tv did one when they were doing a show about calibrating the mildots.
     
  19. GIRLYPANTS

    GIRLYPANTS Banned

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    why not try it yourself at your local rifle club
     
  20. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    Certainly an interesting idea for the sake of curiousity, however I'd say a pointless escapade for your intended purpose.

    Bottom line is that you rifle should be at 10.5+ ftlb for hunting (personally I'll always go for as much as feasibly and legally possible), and your maximum hunting range is determined by your ability to consistently place all your shots inside a 5p-sized group from the position you usually use - typically no more than 30-35yds.

    While not unimportant, the significance of variations in muzzle energy to hunting range are far outweighed by other factors - your ability to rangefind, your ability to judge and compensate for wind, the accuracy you & your gear are capable of.


    For the sake of interest downrange energy retention will vary greatly based on pellet shape, mass, calibre, initial velocity.. chairgun will work things out to a point but this relies on a static ballistic coefficient - in reality this changes with velocity so cannot be assumed to be constant; so the only way to truely know is to measure it yourself.

    I'm quite tempted to invest in an F1 chrony (would like a Skan, but they ain't cheap) to be used in conjunction with my Combro for measuring downrange velocity at various ranges, and hence calculate ballistic coefficient for various pellets and velocity ranges.. perhaps I'll lash up a few tests in the new year :)
     

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