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7mm Remington mag with a slow twist

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  #1  
Unread 03-05-2011, 12:53 PM
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Join Date: Feb 2011
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7mm Remington mag with a slow twist

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.
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  •   #2  
    Unread 03-05-2011, 03:40 PM
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    Re: 7mm Remington mag with a slow twist

    Stay with the 140s and try H 4831sc.

    J E CUSTOM
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      #3  
    Unread 03-05-2011, 03:49 PM
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    Re: 7mm Remington mag with a slow twist

    Quote:
    Originally Posted by J E Custom View Post
    Stay with the 140s and try H 4831sc.

    J E CUSTOM
    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.
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      #4  
    Unread 03-05-2011, 05:03 PM
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    Join Date: Mar 2011
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    Re: 7mm Remington mag with a slow twist

    try v100 3300fps with that with 140s
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