7 wsm coal

[Ryan55555]

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

[dirtball]

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

[Ryan55555]

Thanks for the reply.

Any others???

[Ryan55555]

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

Any other suggestions or comments welcome.