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thanks for all the info... This gun was built for my pap, who shot it very little, the ammo that I got with the gun was all heavy factory stuff (165.grn-170. grn) this might explain why he only ever shot one deer with it. I checked the twist myself with a cleaning rod and jag, the throat and...

thanks for the tip. I'll try the bt 130s instead of the flat base 140s

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...

accurate 270 I've read all these posts, however none mention barrel twist rates.. I've inherited a custom 270 with a 21 1/2" barrel with a 1:12 twist. I've tried H4831sc, and IMR 4831, primers.. 9 1/2, fed 210 and win mag. velocites from 2600 to 3100.... cannot get that elusive sub 1" group at...