The most accurate rifle I’ve ever owned or fired is my 24” 6.5 Grendel AR build, my primary goal was to shoot at 1k plus yards, which I’ve done and I’ve managed 1/ 2” groups at 100 yards while shooting off of a “sled”, but I am no where near skilled enough to regularly shoot that well.
I recently picked up a fluted 22” 6.5 Grendel barrel to replace the 24” currently installed on the rifle, both barrels are Liberty/Satern 1/8 twist with 5R rifling and the 24” is approaching 3k rounds through it so I’m expecting it to start falling off accuracy wise, of course I hope I get another couple thousand rounds out of it, but we all know better than that haha