6mm ARC

[kmon]

Exactly, and they'd probably want to go with a familiar naming convention, PRC, ARC, etc.

Looks like the shoulder is moved back a bit, and the neck is shorter than a standard Grendel.

I'm glad that someone is finally standardizing the 6mm AR, I like my Grendel carbine for a hunting rig, but for actual LR use, this would be mo better.

Looks like the Grendel case with the body shortened .030 inches, overall/headspace length with the same .350 headspace diameter and the headspace being shorter by .030 inches. Hope that makes sense. Really looks like shortened the body by .03. Keeping the case diameter and shoulder angle the same necking to a smaller diameter will give a shorter neck. I suspect the shorter case is to deal with COAL and the AR platform when using the 108gr class bullets length/ogive. .03 inch will not result in much powder capacity loss from the Grendel case to the ARC case and a little is made up for with the smaller diameter bullets extending into the case.