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7 wsm coal

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Unread 11-30-2010, 06:49 PM
Bronze Member
Join Date: Jan 2005
Location: Northern Utah
Posts: 68
7 wsm coal

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.


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  •   #2  
    Unread 11-30-2010, 08:14 PM
    Gold Member
    Join Date: Jan 2007
    Location: Fairfax County, Va
    Posts: 762
    Re: 7 wsm coal

    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".
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    Unread 12-01-2010, 08:55 PM
    Bronze Member
    Join Date: Jan 2005
    Location: Northern Utah
    Posts: 68
    Re: 7 wsm coal

    Thanks for the reply.

    Any others???
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    Unread 12-17-2010, 10:56 PM
    Bronze Member
    Join Date: Jan 2005
    Location: Northern Utah
    Posts: 68
    Re: 7 wsm coal

    I think I will go with 3.100" COAL for this.

    Any other suggestions or comments welcome.
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