6mm ARC

[Gtscotty]

So.... if it's an ammo dude bet he would use a pill he has "in stock" ie, one he makes...?
like a 108 maybe, since that is on the sheet?

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.