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Shooting Forum - Firearms licencing information


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Barrel length affect on velocity

  • 19-08-2007 1:47pm
    #1
    bullets
    Registered Users, Registered Users 2 Posts: 4,612 ✭✭✭


    Said I would mention it in case anyone was interested......

    weird bit of coincidence after some of the peeps here discussing
    barrel length last week. There is an article in the shooting Times & country magazine (16th Aug) About barrel length affect on velocity on a full bore
    rifle. Next week that are trying the same thing on .22lr and .17hmr.

    ~B


Comments

  • #2
    Manic Moran
    Moderators, Society & Culture Moderators Posts: 16,646 Mod ✭✭✭✭Manic Moran


    It's always a balance.

    On the one hand, a longer barrel provides more time for the gasses to expand and provide propulsion. On the other hand, it also allows more drag, and in extremis, if the barrel is so long that the gasses have run out of 'oomph', you end up with a vacuum effect behind the projectile which decelerates it.

    NTM


  • #3
    CJhaughey
    Registered Users, Registered Users 2 Posts: 14,907 ✭✭✭✭CJhaughey


    I think for .22lr 16" is the magic number where any increase in length doesn't give you any more velocity, it might make it more accurate but the powder is all gone at 16"


  • #4
    rrpc
    Closed Accounts Posts: 9,244 ✭✭✭rrpc


    CJhaughey wrote:
    I think for .22lr 16" is the magic number where any increase in length doesn't give you any more velocity, it might make it more accurate but the powder is all gone at 16"

    It's not quite like that. The .22lr round reaches maximum velocity at 15". The powder is not all gone by then, and normally there will be a certain amount of unburnt powder exiting with the bullet.

    There have been some cases of hoovers combusting after they were used in front of firing points. There was a case of spontaneous hoover combustion in Bisley some years ago. :D


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