so what barrel are you running?

[VASCAR2]

Will the grendel 2 shoot factory ammo

Yes, only difference is the chamber throat with a long lead before the bullet engages the rifling. The 6.5 Grendel SAAMI chamber uses a compound throat design whereas the .264 LBC uses a throat design optimized for the 123 grain SMK, but normally will shoot most any 6.5/264 bullet accurately.