Re: 6.5-06 or 6.5 - 284
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yep 8 twist, the old 155 smk's done well with it.
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Last time I checked (30seconds ago)Sierra's heaviest SMK in 6.5 (.264) was a 142gr. if they did make a 155SMK it would need faster than a 1-8" twist, or if you are talking about a 30cal 155gr SMk (that they do make) a 1-8" twist is too fast. very confusing.
It takes 43 muscle's to frown and 17 to smile, but only 3 for proper trigger pull.