11-27-2011, 03:56 AM
The chamber on the 264 LBC AR has a neck that is .295, the Grendel is .300. The throat is also alittle tighter on the LBC AR. Wolf steel case ammo will not work with LBC AR as it measures .295 at the neck loaded and would be very tight to chamber. You can check the neck size by using calipers on the fired cases at the neck as their is suppost to be a .300 neck LBC AR also. The problems that I had with mine was that the 123 AMAX that I loaded at 2.26 were being jammed into the lands about .015 and the bolt would sometimes not close. When I reseated the bullets to 2.235 problems went away. Must check OAL to be sure bullets have about .010 jump.