Am approaching 2k on mine shooting factory hornaday 123amax. Still shoots the same as new. I have a 24" shilen barrel. Ive been told around 5k it will go down with normal use no rapid fireJust curious if anyone knows... ive never heard before.
Running very slow fire single shot, at 2560ish fps. Cut rifle barrel.
Forever . . . a long time, anyway, based on your description of utilization.
If discipline is exercised with respect to rate of fire - for the AR crowd.
Burning ~29 grains of powder in a 6.5 mm bore. A Grendel barrel should outlive a .308 Win by a lot, all other things being equal.
I would guess 1 million rounds...
But seriously, the Grendel is a low capacity, low velocity case. Barrel life with the Grendel should not even be a concern.