Bore Life

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Guest, Jan 20, 2004.

  1. Guest

    Guest Guest

    I have a query which may stretch the grey cells? Or it may have been covered ages ago?
    Here goes - consider two diferent barrels, one in .224 and the other in .243.
    With an identical projectile weight - lets say 55gr and identical muzzle velocities [say 3800 fps] which will have the longest barrel life?
    The answer may be obvious but why?
     
  2. LDO

    LDO Well-Known Member

    Messages:
    251
    Joined:
    Sep 23, 2003
    if based on the same case the 6mm bore will have better life,simply because the wider the the bore the less prone it is to erosion-my-2-dave
     

  3. jb1000br

    jb1000br Well-Known Member

    Messages:
    1,307
    Joined:
    Jul 8, 2003
    yea--what 6br guy said--as long as they burn the same amount of powder as well.

    JB
     
  4. JR

    JR Well-Known Member

    Messages:
    96
    Joined:
    Jan 11, 2004
    the bog standard 6mm has a land depth of .003"(.237-.243 bore/groove), while the 224 uses a standard land depth of .0025"(.219-.224 bore/groove)..so you'd probably find the .224 would be the first to skid...

    JR
     
  5. 4ked Horn

    4ked Horn Writers Guild

    Messages:
    1,519
    Joined:
    Jun 13, 2007
    This answer is based in nothing other than my personal observations of the universe.

    I believe that the tighter the constriction (all else being the same) the longer the hot gasses will stay incontact with the barrel. The gases are hottest at the mouth of the case so this is where the erosion will show the most (because we all know that molecules are more prone to motion in a hot object versus a cold object of the same material)

    Try this. Put an icecube on the counter. put your face very close and blow a lungfull of air straight down at it as hard as you can with your mouth wide open. Now observe how much it has melted as a result.

    Now take a new icecube and do the same thing except this time blow on it through a stationary straw.

    Hope this helps.

    [ 01-20-2004: Message edited by: 4ked Horn ]
     
  6. Mikecr

    Mikecr Well-Known Member

    Messages:
    4,262
    Joined:
    Aug 10, 2003
    Using a WSSM case for ease of 3800 from a 55gr. There is little difference in pressure or powder amount to obtain it(although different powders).
    But the 224 throat will burn out faster.
    More cutting torch effect, I guess.
     
  7. Guest

    Guest Guest

    Thanks for the input everyone.