Free: Contests & Raffles.
Looking at the 6mm AR turbo, anyone have one? Basically a 6 Grendel.
6mmAR, or 243 LBC are probably your best bets, and there are even improved versions of the 6mm AR.I have a 6mm BRX, but it's a little bit on the finicky side and I'm not even sure if you can get bolts for it anymore.
I have a 6x45 and it's one of my faves.