Case Dimensions and Pressure ?'s

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Earnhardt, Jan 15, 2013.

  1. Earnhardt

    Earnhardt Well-Known Member

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    OK, Big time newbie question here.

    When changing case dimensions and neck angle of a cartidge how drastically does that effect chamber pressures and velocity?
    When using the same exact weight bullet and powder how much more velocity and chamber pressure will a .300 WSSM have than a .300 Win Mag
    Or, let's say you have a straight walled cartridge like a .458 Win Mag. If you took that same weight bullet and same weight/type powder and turned the cartridge into a wildcat cartridge how much would that effect pressure and velocity?
    A 5% increase in pressure and velocity?

    How about the opposite. Take a 6mm PPC cartridge and use the same weight bullet and same weight/type powder in a straight walled case.
    How much would the decrease pressure and velocity?
    5%?

    Or doesn't it effect velocity and chamber pressure that much by changing the dimensions of the powder case while using the same weight bullet and powder?

    Thank you for your time.
     
    Last edited: Jan 15, 2013
  2. Bart B

    Bart B Well-Known Member

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  3. Earnhardt

    Earnhardt Well-Known Member

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    Thank you!