Nothing in a gasser. Well, maybe in an ARMALITE or JP.
You're pushing it, in a gasser, when you hit:
77/80gr in 5.56
175/178gr in 308WIN
140/143gr in 260REM/6.5CM
That includes using + 2-3" gas ports with proper diameters.
From 1976 to today, I have never had a subMOA gasser barrel require...