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Patton, if you already have a Savage 260 bolt rifle, why not an AR10 in the same caliber since you reload?
Honestly every caliber you listed there is pretty darned good within its performance envelope. The 260 is a hair better than the 6.5C.
7mm-08 is a good round, but 260 sounds better for your really long distance effort.
Hopefully LRRP will respond to this with more knowledge on the 260.
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I reload for a dozen calibers already. It's part of the hobby. Commonality and/or practicability are not one of my requirements. I know the 260 well. My Savage with a 30 inch barrel is pushing 140 eldm's @2930 fps. My drop is around 25 moa and a 10mph crosswind is under 6 moa. I would never be able to get that kind of velocity out of a gas gun in 260, nor would I try. I do have future plans for a custom, purpose built F-class setup that will probably be in 284 Win, but that's a different rifle with a different purpose and it's further down the line.
So, with that said there are a couple of reasons I am looking at the 7mm-08 vs one of the 6.5s (260, 6.5x47, 6.5 CM).
1) If I compare a hornady 140 eldm @ 2800 vs a 162 eldm @ 2700 I am getting near identical drop and wind out to 1000 yards. The 7mm will have better barrel life and hit the steel targets with a little more force.
2) It's something different. Don't see a lot of AR 10s out there in 7mm. It's a bit of an unknown in this config which adds to the fun.
I really would prefer to keep this thread focused on the 7mm-08 (7mm wildcats like the 7CM are fine) and not turn it into another comparison thread. Like I mentioned in the OP, after evaluating everything I may end up going with a 6.5 anyway. That's why I am very interested in hearing from folks who have one of these and reloaded for it. Good velocity numbers are hard to come by for this combination.
Really it comes down to this, if I can run a long barrel (24-26in) without running into gas/cycling issues and I can push a 160-168 class bullet to ~2700 fps and get acceptable precision (.5 moa) with the 7mm-08 then I'm building one :)