If your gonna shoot the long monometal bullets you may bennifit some, but all in all a 10twist will work great for anything an -06 can shove down the pipe with relitive efficiency.
As far as the 26'' pipe, its plenty long, and may help increase muzzle velocity a bit, but the bennifit to the long bbl is the extra room for a break if you choose to use one.
Barrels tend to be a personal preferance thing in combination with intended use. I personally think your on the right track, but Id go with a 10 twist. JMO, and others may dissagree. I look forward to seeing where this thread leads as far as opinions go. Heck we may both learn something
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Hey on another note, I saw on a post of yours that your from around Burns country. How's the cougar problemb around Delintment lake? I was up there a couple summers ago and I was dissapointed in the lack of critters. I hered the cats were gettin pretty thick up around that country.
Also do you know any of the Browns, McKays, or Stanfords down around Burns and Jordan Valley?
Well good luck on the barrel choice.