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Barrel twist question?? 7WSM / 180 Bergers

 
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  #1  
Old 11-02-2010, 02:02 PM
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Barrel twist question?? 7WSM / 180 Bergers

I am currently building on a Savage action a hunting rifle in 7WSM with plans to shoot the Berger 180g bullets. Barrel length will be 26in.

I ready to order a barrel but want to make sure I know what I want.

What twist would be recommended? I was thinking 1:9, but have also thought about 1:8.5

Any suggetstions or comments would be appreciated.

Thanks,

Ryan
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Old 11-02-2010, 02:04 PM
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Re: Barrel twist question?? 7WSM / 180 Bergers

Ryan,

Both will work fine. Just don't go slower than 1:9" if you want to shoot the 180's. I know of someone who went real fast (1:7" or 1:7.5") and had problems, but 1:8.5" isn't too fast.

Good shooting,
-Bryan
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Old 11-02-2010, 10:20 PM
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Re: Barrel twist question?? 7WSM / 180 Bergers

Don't want to hijack, but I am also interested in building a 7mm WSM on my Savage long action shooting the 180 Bergers. How long a throat should I be asking for in a new barrel?
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Old 11-02-2010, 10:36 PM
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Re: Barrel twist question?? 7WSM / 180 Bergers

1-9 is perfect. I have a Shilen 7mm 1-9 on order and the caliber is either going to be 7WSM or 280.
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Old 11-03-2010, 10:32 AM
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Re: Barrel twist question?? 7WSM / 180 Bergers

Good question Torchrider

I have no idea on throat dimension. Hopefully someone with experience will chime in.

My build will also be on a long action savage.

What barrel are you planning on using?

I am leaning towards a Brux barrel chamber by SinArms.

This is my first custom barrel so I have no prior experience.
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Old 11-03-2010, 12:52 PM
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Re: Barrel twist question?? 7WSM / 180 Bergers

You can find dimensions on all Berger Bullets for planning chambers/throats at this address:
http://bergerbullets.com/Quick%20Ref...%209-23-10.pdf

Also, for the 168 and 180 VLD's, there are prints here:
http://www.appliedballisticsllc.com/...mNumberOne.pdf

I would aim to have the bearing surface just ahead of the neck/shoulder junction when the bullet is seated ~.060" off the lands. This gives you the flexibility of going into or off the riflings while having enough of the bullet in the neck, and not seating it past the 'donut' (ring of thick brass that forms at the base of the neck after several resizings).

-Bryan
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Old 11-03-2010, 10:03 PM
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Re: Barrel twist question?? 7WSM / 180 Bergers

Thanks Bryan - Lots of good information here.

Some of it is over my head but I am learning a ton.
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