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6mmBR Rate of Twist
6mmBR Rate of Twist
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ReedG
14 posts
Nov 08, 2004
6:39 PM
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Ed:
My recommendation is 1:14 ... I have one and it shoots Sierra 55-gr. BlitzKings into ragged little holes (best of .192") @ 100 with 33.5-gr. Benchmark. With 31.5-gr. of Benchmark it shoots 65-gr. Vmax's into the high .200s and .300s very consistently. The 70-gr. Sierra Match HPBT shoots in the .2s and .3s with 33.5-gr. of Varget. These loads are not hot in my gun, but start low for safety.
My barrel is a used Shilen benchrest barrel that was a take-off 6 PPC that had "lost it's edge" for benchrest shooting. All the major manufacturers make good barrels. If buying a new one I would start with Pac-Nor, Krieger or Douglas -- the best grade you can afford. Order a minimum-spec factory chamber in 6 BR Norma with .272" neck and you'll be in for a treat.
Enjoy and keep us posted ...
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ReedG
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Moderator
99 posts
Nov 09, 2004
9:54 AM
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1:14 will give you the best accuracy and probably best velocity with the 55-65 grainers. For a varmint rifle, we'd probably go 1:12, just because it will let you shoot the 75gr V-max and 80gr FB bullets (such as Fowler) as well. The owner of the current gun of the week even reports his 1:12 Shilen stabilizes the 87gr V-max, at least out to 400yards. YMMV, (Maybe his twist is closer to 1:11 on that particular barrel). If you're really going to stick to the 65 V-max the 1:14 would be a great choice. But we think you might find you like the 75gr V-max even better for those long shots.
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