"Hard to get feeding in an auto... More cartridge development focused on straighter wall cases is needed"
Internet BS! And, as usual WRONG...
With FOUR rifles in 6.5 Grendel, I've NEVER had a problem with feeding. Have you shot even one?
"They've got the same issues as all 7.62x39 or PPC-based cases in the AR: they really want a more curved magazine like the AK has."
Duh, have you even seen the 6.5 G case? Instead of "looking later" you need to look now!
The problem with the 7.62X39mm feeding in an AR-15 due to excessive case taper does NOT EXIST with the Grendel case. LOOK at the case, although based on a 7.62X39mm case, most of the taper has been taken out.
Come on guy, seriously, LOOK...
AND, the 6.8 SPC case has MORE TAPER than the 6.5 Grendel, .021" for the SPC vs. .014" for the Grendel.
The 6mm PPC has EVEN LESS taper, .010". Kind of blows you "internet wanna-be expert theory" about case taper.
Both the Grendel and the 6mm PPC have even less taper than the .223 Rem of .024". Again guy, seriously, LOOK!!!
T.