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7stw

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Unread 12-25-2013, 09:13 PM
RCO RCO is offline
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Join Date: Nov 2011
Location: Mississippi
Posts: 10
7stw

I have a custom rifle and trouble getting a good group, I check the twist seem to be 1:10.5. What Im reading the slower twist may have to go to lighter weight.If I do the greefell cal. need a bullet length around 1.4, Im I reading this right. Thanks
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  •   #2  
    Unread 12-26-2013, 09:25 AM
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    Join Date: May 2012
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    Re: 7stw

    Quote:
    Originally Posted by RCO View Post
    I have a custom rifle and trouble getting a good group, I check the twist seem to be 1:10.5. What Im reading the slower twist may have to go to lighter weight.If I do the greefell cal. need a bullet length around 1.4, Im I reading this right. Thanks
    A lot of 7stw's built before the last decade or so were built with 10" twist barrels. My lh 7mmstw has one of those 10" twist barrels and will spin pointy 140 and 150 grain noslers just fine. It gets into trouble with 170 grain and heavier though, and accuracy gets flaky.
    My current load is 140 ab, 82.0 rl25, rem brass, 215-- .5 to .6 moa... 480 yard kill this year. Fed the beast
    I've also used the 150 lrab, 80.0 rl25, rem brass, 215 with good results but didn't have enough groups downrange to shoot my buck with the 150 this year.
    Let her scream with a pointy 140 or 150; you'll have enough energy to get the job done past 1,000 yards and a flatter trajectory in that range also.
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