If you want to pay more money, and not get as accurate ammo, stick with factory stuff. Been to hundreds of match's, and nobody ever won with factory ammo. And if you contact a custom reloader, they could taylor a load for you. Find out what your gun like's. The .223 is an inherently accurate cartridge anyhow. So no matter what, unless the gun is somehow messed up, it'll be a shooter.
I'm not sure what .223 your getting, but with the bullet weight you want to use, I would suggest making sure the barrel twist rate is a 1-9 or 1-8. With that weight bullet, the 1-12 twist barrels might not stabilize the bullet. gypsyman