Take a look at what the winners are using.
Go SS. Kreiger, White Oak, Compass Lake,Pac-Nor all make good barrels.
I am partial to White Oak and kreiger, but I may try a 1 in 6.5 Pac-Nor next for 90 and 100 gr 223 rds.
EDIT: Get a 1 in 7 twist. And use the 77 and 80 gr bullets. they work very well XTC.