Bottleneck Ammo

Discussion in 'Ammunition & Reloading' started by Pistolero, Jul 12, 2007.

  1. Pistolero

    Pistolero New Member

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    Does anyone know why some bullets are smaller at the top and bigger at the bottom?
     
  2. robocop10mm

    robocop10mm Lifetime Supporting Member Lifetime Supporter

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    Bottle neck ammo

    To make room for more gunpowder to make the bullet go faster. If a .223 was not bottlenecked it would be scarcely better than a .22 magnum.

    A side benefit is feeding. If you are chambering a .22 caliber bullet into a .36 caliber hole it goes in easier with fewer malfunctions.