7mm Remington mag with a slow twist

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by 30-06, Mar 5, 2011.

  1. 30-06

    30-06 New Member

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    Feb 27, 2011
    I have a 7mm rem. mag with a 22", 1/11.5 twist Douglas barrel from the '60's.
    It will shoot heavier bullets OK, however bullets in the 140 gr. range are shooting lots better than their bigger brothers. As one would expect my velocities are off a bit also because of the shorter barrel.

    I shot lots of stuff through the barrel and spent several days at the range shooting and cleaning however the best I could do is 3216FPS with 65.0 IMR 4350
    behind a Nosler BT .66 CTC 5 shot group. Sd was not there and I could not get this to repeat itself. So still looking

    Does anyone have software that could give me starting place for a faster powder like Varget or something around in that burn rate.
     
  2. J E Custom

    J E Custom Well-Known Member

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    Jul 29, 2004
    Stay with the 140s and try H 4831sc.

    J E CUSTOM
     

  3. 30-06

    30-06 New Member

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    Feb 27, 2011
    I tried that already, the best load I development I came up with, H 4831sc was.
    VEL 2945
    SD 32.0
    ES 56.25
    3-4" group

    Thanks for the suggestion.
     
  4. taz 309

    taz 309 New Member

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    Mar 1, 2011
    try v100 3300fps with that with 140sgun)