I like the SR 25 better, but it is pricy and may not be available to civilians soon.
The AR 10 T's that I have work every time. the 308 shoots under moa. (fed gold match ammo) I have to do more load work for the .243 but I think it will shoot. The SR consistantly shoots 1/2 moa out to 500. (factory ammo, even better with handloads)
If you will be using a bipod you will want the floating handguard version.
Tom consider the 6mm 22-250 should be easier on barrels, recoil wise a good choice and the throat should last more than 2000 rounds.
I have two, An A2 20" and an A4 carbine 16". I had problems with A4 until Armalite sent different extractor spring to try, now no problems. Both are 1 1/2 - 2" rifles @ 100 yards. I'm sure I could improve with handloading.
quite a collection going there
which comp do you like as you seem to be into testing them
by the way ybbeat
the AR10 T in 243 turned out to shoot quite well. Crown the barrel realign the gas tube
open the hole in the barrel nut, polish the feed ramps on the barrel extension.
10 shot group into .7 at 100 yds
ps they did not seem to like the jewel trigger though. doubling in 243 is a bit more of a hand full when your not expecting it.