683 yards on a bull elk, 300WM driving 200ABs at 2945 fps. Tough critters, I put 4 into the vitals because he didn't even react until the 3rd one and stayed on his feet for a shot while even after the 4th.
I limit myself to about 800 yards as my rangefinder poops out around there typically, and also I do not get enough practice at distances longer than that.
I put a 338yd doe kill with a muzzleloader in the same class as the above shot, ballistic compensation was about the same and an Omega is not in the same league as a Sendero.