My buddy actually owns (2) 25's, one of them a garden variety Ruger, the other a Marlin xl with a 25-06 AI barrel on it. He went with a Shilen 26" long - 9" Twist.
One of the bullets he likes is the 115gr Berger vld. The other is the Barnes 115gr TSX. The TSX is longer than the Berger, and unlike the Berger it is not considered "Stable" down to (-40 F.) @ 0 ASL, /shudder. The TSX in a 9" twist is "only" considered stable down to about (-10 F.) @ 0 ASL. "Hey, if you are going to say *STABLE* then that has to mean stable under any conceivable condition you may hunt." <-- (my friend John) My friend is a verified hunting Nut-Case! He spec'd out the 9" twist because he did not for-see himself hunting at less than (-10 F.) @ 0 ASL. Now if you go up to say 3000 ASL then you can go down in temp to about (-40 F.) again .... heh...yeah i'm thinking do Whaaa? Then again I know some folks are certified nut-cases just like my friend is! He has hunted the Alaska low lands a couple times, but more often he hunts between 3000-8000 ASL here in the lower 48.
So, for him, the 9" twist made a lot of sense. Did We/He over think it a bit? Perhaps. Then again, he is the one person I have ever Taught Reloading to, specifically because of his attention to detail. He is a very serious minded individual when it comes to anything related to hunting.
Powder wise, he went with H1000. He only uses those 2 heavy bullets, so for him H1000 was a slam dunk. He uses mainly Win LR primers, and standard Rem. I believe, though I know he does have some nickel Rem. brass as well. The H1000 is very temp stable, and with the right bullet/brass/primer combinations truly easy to load with. I do not have his load data of course, but that really don't matter as it is best to work up anyhow. For his AI I know he started 1.5gr. below Hodgdon max for the 117 for the Berger's, not sure where he started for the Barnes, but I would suspect pretty close to the same. Always Use Caution!! Start Low and Work UP!
P.S. I have seen him take a coyote at about 750ish with one shot at one of his favorite shooting spots.