how do you call impacts at that distance with 22LR?
I've shot my 16.5" mk2 at 300 yards and was hitting paper (12x12). I think I needed like 9 or 10 mrad of elevation and 0.4 mrad windage from a 50m zero.
Not that difficult, just needed a lot of spotters to get on target (no drop chart).
Good high end match ammo will accomplish this. I believe 10 years ago I was using lapua rimfire for such a purpose.