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Speed of pellet

Discussion in 'Anything Airgun Related' started by Amego, Apr 8, 2014.

  1. Amego

    Amego Active Member

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    Location:
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    Hey guys was just thinking when you crono
    when does the pellet reach its max speed surely not when it goes through crono ???
     
  2. Dunkman

    Dunkman Posting Addict

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    Max Velocity will be a the point it leaves the barrel as after that point, it has to fight its way through the air, losing energy as it goes.
     
  3. jesim1

    jesim1 Kit bitch to the Stars

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    Location:
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    Spot on, a chrono will always be used very close to the muzzle to measure maximum velocity unless you are measuring downrange for say power retention. Just watch you don't shoot your chrono, it's probably the way most die.

    James
     
  4. Dag

    Dag Pro Poster

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    Probably a good reason for using a Combro strapped on to the end of the barrel.
    Sounds like you may not have used Chairgun yet? If you do and load your choice of pellet and muxzzle velocity it will give you the ft/ sec throughout the pellet's flight from muzzle to dropping to the ground.
    hth
    Dag
     
  5. Accuspell

    Accuspell Pro Poster

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    No it won't, it will give you the THEORETICAL figures....I have found them to be close, but not perfect.
     
  6. Dag

    Dag Pro Poster

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    Point taken Accuspell. But if you have little or no knowledge of the performance of a pellet and rifle then it will be of interest and informative. I assume, hopefully, that Hawke have carried out extensive tests with various pellets , rifles of differing power levels, and measured over various distances to give pretty accurate information.
    atb
    Dag
     
  7. Dunkman

    Dunkman Posting Addict

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    I bet they haven't. I bet they have used a ballistic mathematical formula to arrive at te figures in the programme, hence the discrepancy between theory and actual.
     
  8. terry1001

    terry1001 Major Poster

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    I suggest that the maths behind Chairgun (and similar programs) is more reliable than the user data which is used to calculate the pellets downrange behaviour. If you're interested enough you can change the various properties (one at a time) to see what effect they have. A few things to consider are:
    pellet weight - often different to what it says on the tin
    BC, ballistic coefficient - which is affected by weight and shape plus other factors which can't really be observed by the shooter
    muzzle velocity - simply measured but how do you decide which measured velocity to use?
    scope height - measured centre of bore to centre of scope and is not as easy to measure as it might at first appear
    scope magnification setting
    air temperature
    air pressure
    humidity
    etc etc
    All of these things affect the pellet trajectory and then you have to consider the shooter, unless you can mount the rifle in a vice which will not, under any circumstances, move.
    Chairgun and similar programs are great for getting a good idea of what you can expect but they should always be confirmed by shooting. In particular the holdovers and aim points are affected by the scope magnification and if you rely on the markings on the scope you will probably get a nasty surprise. Never rely on anything or anyone, always check for yourself.
     

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