

Bud - go shoot a "tactical" comp or two. A standard rifle will do. Like an off-the-shelf Rem 700 VS. Got a 2nd place State LE trophy gathering dust around here someplace, shot w/factory ammo and a factory built rifle I picked up used for $400.
Another buddy took a factory built .223 Rem and won the "best group" at a the big sniper match at Boise Idaho a couple of years ago.
These days my rifle is a little fancier, and technically shoots better, but I'll be darned if I'm winning as often. In tactical stuff it's the shooter, not the rifle. If your rifle will average somewhere around 1/2" to 3/4" it will be competetive - if you are.
Hmmm... Might want to go sit quietly and watch carefully at a benchrest match or two and a highpower or f-class match or two as well. Plenty to learn. Lots of good guys out there who can build you a very good tactical rifle. I tend to favor Rick Freudenberg and Jim Cloward, a couple of outstanding rifle builders here in the Pacific Northwest. Let me know if you want Jim's phone number, he's the U.S. Palma team armorer and knows his way around an accurate .308 rifle. Rick's website is http://www.freudscustomrifles.com and he builds a mighty fine rifle as well. They've both built rifles used by winning shooters at major competitions, as well as rifles used by real-world tactical operators.
BTW - I know a few of the guys who've answered you and they have my respect. Great riflemen! Their advice has been on the spot.
Semper Fi, Guy