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Low Velocity - High, High Velocity - Low ???

Discussion in 'Handloading and Reloading' started by Zerstoerer, Jul 24, 2006.

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  1. Zerstoerer

    Zerstoerer Member

    Joined:
    Dec 5, 2005
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    341
    Location:
    Desert Southwest
    I don't understand:
    A factory round leaves the barrel at 2650 fps and hits 2 inches low at 100yards.
    My handloads leave the barrel at 2500 fps and hit 3 inches high.

    Both .303 British, 150 gr. SP Bullets out of an scoped Enfield No.4 Mark II.

    What am I missing here - should it not be the other way around with the lower velocity hitting the target lower ?
     
  2. ChristopherG

    ChristopherG Member

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    Jan 7, 2003
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    Location:
    Central WA
    This kind of thing can be perplexing. A slower bullet spends a slightly longer time in the barrel, right? And what's the barrel doing while the bullet is in there? Recoiling, including rising upwards. So a slower bullet stays in the barrel until the muzzle is actually pointing higher before it releases--and the direction the barrrel is pointing at the moment the bullet exits determines its trajectory.

    Internal ballistics, it's called--the stuff that happens before the bullet even leaves the barrel.
     
  3. BluesBear

    BluesBear member

    Joined:
    Jul 25, 2003
    Messages:
    7,672
    Location:
    The Great Pacific NorthWet
    Handgun shooters have had to deal with this for years.

    When 125gr 38 & .357 loads became all the rage everyone was suddenly finding their old fixed sight revolvers were shooting LOW with the higher velocity ammo.

    ChristopherG explained it pretty well.
     
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