6mmAR loads.

[Popeye212]

I am using a Columbia River arms barrel in .243lbc, 22", 8 twist, it's the same as the 6mmAR and the 6mm Predator. Columbia makes the barrels for Black Hole Weaponry. They use polygonal rifling which give you about 100-200 fps more speed because of the way the rifling is cut.

So what dies do you order and is it not formed from the Grendel brass. That was where I was headed using the Grendel case. My other question is the bolt fit on ARP barrel extension proprietary to the his barrels. In other words will .136 BCG I have fit.