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7mm STW with suppressor, need advice on barrel length.

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Unread 12-03-2013, 09:16 PM
Bronze Member
Join Date: Nov 2010
Posts: 39
7mm STW with suppressor, need advice on barrel length.

I am in the process of having a 7mm STW built and need to order the barrel. It will wear a suppressor and i am not sure what barrel length to go with. the suppressor is 9 inches long. Can i have a heavy contour 20" tube and get all the benefits of the round. I am hoping i can keep the finished length with the suppressor under 30". Anyone have any insight on this or know someone running an stw suppresed. thanks.
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Unread 12-03-2013, 10:32 PM
Platinum Member
Join Date: May 2012
Posts: 4,267
Re: 7mm STW with suppressor, need advice on barrel length.

I'd go with at least a 24" bbl. with the stw. If you weren't hanging that long of a can on the end I'd say to go with 26" or more.
Can you go to an 1885 or #1 action to get the overall length of the rifle down??
If you are stuck on a 20-22" bbl. length a 280AI or 7rem may be a bit better option as it'll make less noise with the can and will make use of the shorter barrel length better; you'll probably get nearly the same speed with all three cal's in a 20" bbl and the stw will be harder to get accurate as your muzzle pressure will be higher and want to kick the bullet around a bit more.

The strain gauge graph here is the win 150 grain factory load fired in my old sendero 7mmstw. Notice the secondary peak; that was a tight spot at 16" down the bore and the pressure is still at 30 Kpsi.
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