I think you are going to like it. I got my 18" .308 barrel on last week and got to shoot it for the first time two evenings again. I don't normally do a break-in, but I decided to this go around. I did my sighting in throughout the break in and got it zerod in the first strand of 3 shots. Once I completed the process (8 shots later), I cooled the barrel down and decided to try ringing some steel at 250 yards. I had my DOPE from another .308 rifle in a 20" barrel, so I dialed and gave an extra mil or two. Missed just under the targeted. Gave it one more mil and smack!
I haven't shot any groups with it but so far I am really liking it. The few ounces removed vs the factory barrel make it even more pleasant. I hope you enjoy it.