I, personally, consider any range beyond which an adjustment either to the elevation of the scope or a shift in the point of aim is necessary to hit the animal in questions vitals. For my muzzleloader(a Savage 10ML-II), this is 200 yards on deer. For the .30-06 it's about 275 yards, and for the .257 Weatherby Mag it's about 340 yards. I sight my rifles in for Max Point Blank Range (MPBR), and use +/- 3" for the size of the kill zone for deer (6" across). This is intentionally a bit smaller than the actual vital zone of a deer (which is actually about 10" across on a mature deer), to account for group size and aiming error. Anything beyond the above ranges I'd have to either adjust the scope or use holdover, which I classify as "long range" shooting.
This is not to say that my working definition of long range shooting is applicable to anyone else. To a guy like Ridge Runner, a 340 yard shot at a deer is practically pistol range (JK, RR, but close!), truly a chip shot. Me, I'd be hesitant to take it unless the conditions were perfect.
Mike