Wheh I googled "long range" shooting this is what I found;
There are always exceptions, of course. Jack O'Connor himself killed big game animals at over 300 yards, and other masters like Bob Hagel, Warren Page, Elmer Keith, Pete Brown, Francis Sell, and Townsend Whelen did likewise. But these men had the skill and the experience to justify such shooting. They lived at a time when game was much more plentiful than it is today, and when bag limits were generous or nonexistent. As full-time professional gun writers, they had the opportunity to shoot an enormous amount of ammunition through a very wide variety of rifles, and to spend a great deal of their time hunting. Such opportunities were rare then, and are almost nonexistent now. The times have indeed changed, and not always for the better.
I would like to conclude by pointing out that long range shots are less common than might be inferred from reading the sporting magazines. Most big game animals in North America are killed at under 200 yards; in fact, most are killed at less than 100 yards.