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7mm twist rate?

 
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  #1  
Old 12-19-2007, 12:45 PM
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7mm twist rate?

I'm going to have a 7mm WSM built for long range hunting and need advice on barrel twist rate. I plan on shooting 160 AB's, or 162 a-max but would like the option to go up to 180 bergers. Would a 1:9" twist work for both? (Berger recommends 1:9" for 180 gr. and 1:10" for 168 gr. whereas most of the barrel manufacturers recommend 1:9" for anything over 140 gr.) Any ideas? Thanks
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Old 12-19-2007, 12:49 PM
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You already have your answer: 1:9
That's the right twist..
What kind of ideas are you looking for?
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Old 12-19-2007, 01:06 PM
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Quote:
What kind of ideas are you looking for?
I guess just verification that a 1:9" would not be too fast for the 160 gr bullets. Or has anybody used 1:9.5" or conversely 1:8.5"? Just checking if anybody had any other alternatives/ideas.
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Old 12-19-2007, 02:11 PM
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I would build on a long action if you intend to shoot the 180s and have it function as a repeater. Mine shots the 180s into 1/2MOA with a 9 twist. Only problem is I have to load them very deep so they fit in the magazine. Everything is just a little jammed up and would IMO just work better on a LA. I dont even want to know how well this thing would shoot if I could reach the lands. I will not even try it because I know I will end up loading them long and shooting single shot.
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Old 12-19-2007, 03:18 PM
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I've got a Rem 700 300 SAUM that I'm getting the action from and plan on using a Wyatt's box mag., so this should take care of bullet seating depth issues.
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Old 12-19-2007, 05:04 PM
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9 would be the right twist. those 180 Berger's are a long bullet. i'm also in favor of the long action.
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Old 12-19-2007, 05:11 PM
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i just got my 7mm wsm built.i am shooting the 168 bergers but have tried 180s. there is no question that you have to go with a long action. then you will need to get the hs bottom metal in 300 wm. this is a great combination.
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