AR style weapons are very accurate!!! More accurate than what you normally read or here about them!!! When coming from a company like SSK Industries, Armalite, Colt, Bushmaster,Olympic, and many other companies with a good reputation they are phenominal.
Just remember when you want accuracy you don't want the GI Joe look alike. In bigger calibers like 300WSM like I believe SSK and Armalite offer you are going to go for a longer barrel. The other things to think about are that the barrel needs to be fat and have the tube grip. I also like flat top models because you can go from scope to night scope to carry handle if you want! If you hand load your own ammo you will love an AR!!!