Case capacity

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by barnesuser28, Mar 30, 2012.

  1. barnesuser28

    barnesuser28 Well-Known Member

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    Which of the wsm family of cartridges has the most case capacity?
     
  2. elkaholic

    elkaholic Well-Known Member

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    The body is longer on the 7 WSM.......Rich
     

  3. Mikecr

    Mikecr Well-Known Member

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    Minus the necks, the 7WSM is 1gr higher than the 300WSM.
    Including the necks they match, both ~1gr over the 270WSM.

    Differences from reamer to reamer would separate them more than design.
     
  4. JeffVN

    JeffVN Well-Known Member

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    Interessting I was under the impression that the 7WSM had the highest case capacity of the three.

    Jeffvn
     
  5. elkaholic

    elkaholic Well-Known Member

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    The 7mm does have the highest USEABLE capacity. The reason the 300 equals it is because a .308" diameter neck obviously holds more than a .284" neck. That is why when I'm building a wildcat, I always consider where the base of the bullet is going to be and what is an adequate neck length. A good example of this shows up in the amount of freebore in a given chamber. All things equal more freebore equals less pressure with a given load which equals less velocity; however, loaded to equal pressure "MORE" velocity is possible because of the increase in volume (capacity) due to the distance before the bullet contacts the lands......Rich