I don't think the difference in accuracy between a, say, 60 or 69 Sierra over a 77 is useful. Even they are 1/4 minute better, what are you gonna do at <=200 that couldn't be done with the 77? Further out, the 77 beats them in the wind.
I use light bullets up close not so much because they are more accurate, but because they cut down on recoil.
Those Criterion's are very nice barrels. I sighted one in with 52s and got about a 1/4" group for 3 @ 100.
