7 wsm coal

Discussion in 'Long Range Hunting & Shooting' started by Ryan55555, Nov 30, 2010.

  1. Ryan55555

    Ryan55555 Well-Known Member

    Messages:
    68
    Joined:
    Jan 27, 2005
    I posted this question in another section and did not get any responses. Hopefully this is the correct section.


    Hello all -

    Working on a dummy round to send so the smith can cut my chamber.

    I have a Savage LA and plan to shoot the Berger 180's.

    I will be using standard Win brass in 7WSM.

    Please check my math on this:

    Brass (Win)

    OAL = 2.100
    Base to neck = 1.857
    Neck length = 0.243


    Bullet (180 Berger)

    OAL = 1.525
    base to bearing surface = 0.220
    bearing surface length = 0.541
    ogive to tip length = 0.764


    To use all of the neck on the bearing surface:

    shortest COAL = 2.621 (would not want to do this)

    longest COAL = 3.162


    I was thinking of going 3.000 COAL. This would leave room to move the bullet in and out a little bit.


    Please let me know if I am on track of missing something.

    Thanks,

    Ryan
     
  2. dirtball

    dirtball Well-Known Member

    Messages:
    764
    Joined:
    Jan 18, 2007
    First let me say that my 7mm WSM is a single shot with a long action so total cartridge length was not dictated by mag length or action port length. When I was in the process of building my 7mm WSM I called Dave Kiff at PT&G and he recommended a .190 freebore for the 180 Berger which is what I went with and my loaded rounds measure 3.135".
    Dave
     

  3. Ryan55555

    Ryan55555 Well-Known Member

    Messages:
    68
    Joined:
    Jan 27, 2005
    Thanks for the reply.

    Any others???
     
  4. Ryan55555

    Ryan55555 Well-Known Member

    Messages:
    68
    Joined:
    Jan 27, 2005
    I think I will go with 3.100" COAL for this.

    Any other suggestions or comments welcome.