7mag vs. 7-08 sight in

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by florida boy, Jul 14, 2013.

  1. florida boy

    florida boy Active Member

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    Jan 16, 2013
    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
     
  2. g0rd0

    g0rd0 Well-Known Member

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    517
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    Mar 9, 2012
    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.
     

  3. varmintH8R

    varmintH8R Well-Known Member

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    Dec 12, 2011
    +1. Your rifle is telling you what it likes!