I load 6.8mm in a Rem bolt rifle.IMR-4198, and AA-1680 have produced the fastest loads from my 20"barrel.For using RL-10x in your AR the New Hornady manual lists the following:
110gr.bulletBTHP #27200
starting load-23.8gr RL-10x= 2200fps
max load-26.6gr.RL-10x= 2500 fps.
The test rifle was a DPMS-16" 1 in 10 twist.
Hornady cases were used.
This Hornady bullet has a cannelure.
This cartridge has proven to be very accurate in both bolt and semi-auto rifles.COL 2.245"