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7mag vs. 7-08 sight in

 
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  #1  
Old 07-14-2013, 03:11 PM
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Join Date: Jan 2013
Posts: 9
7mag vs. 7-08 sight in

My 7-08 Weatherby Vanguard w/ 1:9.5 twist loves Hornady superformance 139 gr. sst's. I average .360" 200 yd groups.
I bought a TC Venture in 7 mag last year, same barrel length, it has a 1:10 twist. Started shooting a few months ago after mounting scope, got serious with sight in this weekend. I had used 150 Fed. Fusions to get close because they are cheaper and planned on hunting with the 139 Hornady's. I started at 350 yards because I wanted to see how the BDC reticle worked on the scope.
I got 4" - 5" groups w/ the 139 grain sst's and 1.5" w/ 150 fusions ???!!!
Moved to 250 yards today to verify zero did some tweaking on scope and Fusions are real close to zero, SST's all over the place ! Just wondering what everyone thinks, because I thought the SST's would shoot well, like the 7-08. Do you think it's the velocity of the Superformance ? I wouldn't think the slight twist rate difference would matter.
Sorry for the long post
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  #2  
Old 07-14-2013, 04:18 PM
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Join Date: Mar 2012
Location: New germany, NS
Posts: 279
Re: 7mag vs. 7-08 sight in

7mm 1 in 10 twist with 150 0r 160 grn bullet around 3000fps should give you excellent accuracy.
I have 7mmrm 1 in 10 twist and it loves 150 grn at 3010fps (.750" at 100 yd)
with 139 / 140 I need to slow them down to 2600 to get the same results.
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  #3  
Old 07-14-2013, 08:40 PM
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Join Date: Dec 2011
Location: Michigan
Posts: 1,054
Re: 7mag vs. 7-08 sight in

+1. Your rifle is telling you what it likes!
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