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7wsm coal

 
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Old 11-29-2010, 10:15 PM
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Join Date: Jan 2005
Location: Northern Utah
Posts: 66
7wsm coal

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
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