after looking into the 6.5 grendal and discovering that the only commercial reamer made for it was designed for a bolt action and considerd to tight for a auto, and no one will cut a reamer like the AR,S are using. I started thinking about just necking down 7.62x39 brass to 6.5mm and leaving every thing else the same so it would work in a standard AK mag. (custom reamer still recuired but can have made) I am told that the 6mm ppc and 6.5 ppc will not as the case has been straightend out and jams in the curved mags. a necked down 7.62 round would still give good performance just not as good as the grendal. might possably be able to neck up a 22 russian although the brass is $$$.