I have Rem 700 Senderos with the heavy 26" barrels and the heavy synthetic stock that I believe is of HS Precision design. One is a .308, one is .25-06. I believe they are quite nearly the same rifle you mention.
They are ungodly heavy to carry around, but that's the idea. I can get MOA groups at 100 yds and if I fooled with the loads more I might do better. I have not shot them beyond 200 yards. Actually, I had the barrrel on the .308cut back to 20" like the "tactical" rifles that are out there, and it became more accurate and better balanced in the hand. The triggers are good, but not as good as putting a Timney trigger on. I have not tinkered with the triggers.
I like the rifles, but I have a Rem 700 Classic .30-06 and a Weatherby Vanguard Sub-MOA in .25-06 that carry easier and are more accurate, so I must admit I don't shoot the Senderos very often. Still, as a platform for a long-range rifle that will usually be shot from the bench, they're good.