308 and 6.5 Grendel only 2 we run and for years we only ran the Grendel, just added the 308 recently. Try to wear a barrel out on either but especially so with a 6.5 Grendel.
Volume shooting a Grendel is great for lots of reasons, hunting with one has some pretty cool benefits also, drt's pretty much everything we point it at to 420 yards so far (even launched from 16.1" barrel at only 2386 fps factory eldm) but that lower pressure factory ammo is super quiet if un-suppressed in terms of getting additional shots off if you miss or can fill multiple tags etc. The entire county doesn't really hear it, be lucky if a landowner or neighbor hears it past a few hundred yards. If I only hunted deer size game and predators it would be Grendel all day long but my process was max versatility for predators and big game and factory ammo, plus don't ever wanna think about a barrel, also like over 120gr projectiles so the pea shooters don't make my list. .5 bc is plenty and .25sd also proving the shizzle with eldm bullets. Boring if you run either of these in calculators against the 6mm's etc. but real world has been nothing but great performance. We don't really have much need to go past 4-500 on anything and they both are boring and easy to shoot those distances, even 600 has been easy when we play at range. Most work potential for powder burned in ranges we actually use it.
If I could get a Grendel in nicer rifles like a sako 90 peak I probably wouldn't even have bought the 308, I just wanted nicer rifle mostly so aimed for similar ballistics and characteristics of the Grendel in my choice for the sako, shoots great at 600 with factory 168 eldm.