01-10-2020, 10:30 PM
Not 100% sure if this is the same caliber you are talking about, but there is some discussion going on over in a different subforum, might be worth a look.
http://www.65grendel.com/forum/showthrea...iber-6mmAR
http://www.65grendel.com/forum/showthrea...iber-6mmAR

