I think if factory ammo is a concern, I would go 6.5 Grendel all day. You can buy cheap wolf steel cased or nicer brass cased hunting ammo. The 6.8 is a neat cartridge and I’ve killed a few deer with it but it’s essentially dead when looking for factory offerings. I own both but I reload. In my area I see a lot more Grendel on the shelves available for purchase than 6.8. YMMV