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7 mm WSM

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Unread 01-14-2004, 08:34 PM
Junior Member
Join Date: Oct 2003
Location: Vinton Va
Posts: 2
7 mm WSM

I am thinking about building a 7mm WSM to shoot 120gr. bullets. What twist barrel would I need to shoot the 120's at a high velocity? Has anyone had any experience with this setup. Thank fir input.
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Unread 01-14-2004, 09:06 PM
Silver Member
Join Date: Sep 2003
Posts: 347
Re: 7 mm WSM

I think a 1-9 or 1-10 will stablize the 120's just fine as well as all other 7mm bullets. with 26in barrel and up you should get 3600 to 3700 Fps. Will be excellent for hogs out to 1000 yards. I am swithing from 180's in my 7 wsm's, To the lighter noslers, I don't which one yet. The 120 nor 140's should work great. They kill good, have good b.c and are very fast. Good Luck Reed
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Unread 01-14-2004, 10:07 PM
dwm dwm is offline
Gold Member
Join Date: Feb 2003
Location: Texas
Posts: 639
Re: 7 mm WSM

There is an interesting twist rate tool available at:

Twist rate is a function of bullet length and velocity.

This web site states that if your bullets are going at high velocity the twist rate does not need to be as fast. Bullets stablize at a certain rpm so a slow twist but high velocity will produce the same rpm as high twist rate and low velocity.
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