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My 10.5 sports a 1/7 CHF barrel made at the same FN factory as the DD barrels... It likes norc for CQB and Fed black box out past 50m. I've had very poor accuracy from both weight Barnaul. Not even CQB worthy in my books...
I have a Mk18 and its Norinco 55gr. This ammo actually specs out good over the chronograph. Other than the Norinco stuff XM193 Federal and XM855 gets my vote. Take out the LC XM193 stuff at dusk and you will understand why my friends call my Mk18 the Dragon Slayer. If the bullet doesnt get them the muzzle flash will!
Mine takes Winchester White box 55gr and AE 55gr. Out of a 10.5. 2-3 inch groups with holo sight at 50. Not really played much with it for accuracy yet.
I have found that the shorter barrel ARs prefer the heavier weight rounds. I have used M855 (useable) and a variety of 75-77gr. OTM ammo to good effect.
I'm shooting Norc 55gr ammo right now. I have had zero keyholing in my DD barrels, unlike some others who have had bad results. Works for me for just plinking.