Gunsmithing 7WSM chamber spec's??

[leoestby]

Hi, I'm planing to build a custom rifle in 7WSM. But need some input on the chamber...

Here are some information I have:

Max magasine length: 2,952"
Bullet: A-max 162grs

I will true up the brass with neck trimming. (I guess about 90% cleaned up)

 

[Mgordon]

Re: 7WSM chamber spec's??

Are you running it in a long action or a short action?

We have different 7mm WSM reamers for different OAL.

Mark

 

[mcfred]

Re: 7WSM chamber spec's??

Roughly a 0.317" neck diameter and just about zero free bore to fit that mag.

 

[leoestby]

Re: 7WSM chamber spec's??

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: M.Gordon</div><div class="ubbcode-body">Are you running it in a long action or a short action?

We have different 7mm WSM reamers for different OAL.

Mark </div></div>

It's a custom action that moeves maximum 3,937 (100mm)

 

[leoestby]

Re: 7WSM chamber spec's??

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: McFred</div><div class="ubbcode-body">Roughly a 0.317" neck diameter and just about zero free bore to fit that mag. </div></div>

0,317" for 90% turned winchester brass and A-max bullet?

 

[leoestby]

Re: 7WSM chamber spec's??

Anyone know the standard free bore and neck diameter for 7WSM?

 

[mcfred]

Re: 7WSM chamber spec's??

If you're talking a commerically available rife chambering then you can probably just go to www.saami.org and get the default drawing like so:

http://www.saami.org/pubresources/cc_drawings/Rifle/7mm%20Winchester%20Short%20Magnum.pdf

FWIW my PTG .317" 7wsm reamer's a tight "no turn neck."

 

[tstevens]

Re: 7WSM chamber spec's??

So what is a common freebore length to be able to feed bergers and other vlds from a sa 700? Thanks.

 

[Dave-O]

Re: 7WSM chamber spec's??

I have 2 7wsm reamers..

The first one is a .315 nk with a .104 freebore, that with a 162 amax loaded to touch the lands, it would have a OAL of 3.024.

The second reamer is also a .315 nk with a .040 freebore, again a 162 amax will hit the lands at 2.960 oal.

The 162 seems to be very jump tolerant in my current rifle that is chambered with the first reamer. I'm jumping them right at .075 thou with favorable results...

 

[tstevens]

Re: 7WSM chamber spec's??

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SubMOA</div><div class="ubbcode-body">I have 2 7wsm reamers..

The first one is a .315 nk with a .104 freebore, that with a 162 amax loaded to touch the lands, it would have a OAL of 3.024.

The second reamer is also a .315 nk with a .040 freebore, again a 162 amax will hit the lands at 2.960 oal.

The 162 seems to be very jump tolerant in my current rifle that is chambered with the first reamer. I'm jumping them right at .075 thou with favorable results...</div></div>

Looks like it would about take zero freebore to fit a secant ogive bullet in a standard length 700 box or else go with .040" freebore and install a wyatt's box.