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  1. M

    270 Help needed

    Inherited a custom 270. Mauser action, 21 1/2" barrel, 1:12 twist..I'm trying to get 140 grn BTSP into a sub 1" group @ 100yds. I've tried Imr 4831, and H4831sc. Federal 210 , Rem 9 1/2, and win mag, primers. velocites of 2600fps to 3100fps. Barrel is full floating. I'm not sure if the 1:12...
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