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6.5wsm twist rate ?

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Unread 02-10-2007, 03:57 PM
Silver Member
Join Date: Nov 2003
Location: South central Montana
Posts: 129
6.5wsm twist rate ?

I'm having a 24" Varminter barrel made, I intend to shoot 140 grain Sierra MatchKings at near 3200fps. I live in a colder climate and will be shooting at altitudes of 3000 to 10,000' . The barrel twist calculator i used said a 1:9 twist rate is best. What would you suggest?

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Unread 02-10-2007, 04:53 PM
Platinum Member
Join Date: Jul 2002
Posts: 2,855
Re: 6.5wsm twist rate ?

the 1-9 would probably work fine bt the 1-8 would certainly work and if you ever wanted to shoot heavier bullets it woulden't be any trouble. The slight differance in twist isn't going to make any negitive effects some folks claim that it will reduce velocity , I have yet to see this proven to any significant degree.
I don't think that you'll be shooting these bullets fast enough to blow them up from over spinning and I don't think that you will have any trouble with "overstabilization" another claim I've yet to witness.
Si Vis Pacem Parabellum
Molon Labe
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Unread 02-10-2007, 10:01 PM
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Join Date: Dec 2002
Location: mathias wv
Posts: 987
Re: 6.5wsm twist rate ?

Ray Romains builds 6.5 Gibbs LR rifles, when he did mine he told me the 8 is what I wanted, he's built 30-some of the gibbs, he claims 3300 fps w/a 140.
Born to Hunt, Forced to Work!
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Unread 02-10-2007, 11:19 PM
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Join Date: Jan 2005
Posts: 126
Re: 6.5wsm twist rate ?

Mine is a 1:7.75 27 inch gain twist barrel.Very accurate at 2900-3000 fps.When you get it up to 3200 with 140's please post your loads.I haven't found a powder or load yet to get up to that velocity.I have tried Retumbo,H1000,Imr 7828ssc and am about to try Varget when the weather warms up.
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Unread 02-14-2007, 02:17 PM
Junior Member
Join Date: Dec 2006
Location: Ne-vaa-da
Posts: 9
Re: 6.5wsm twist rate ?

Who made your gain twist barrel?
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