The .243 is effected by wind, the .338 is effected by wind.Some friends and I were trying to zero some rifles in the edge of Wyoming in a 15-20 mph wind. Tried some .338
200gr BT and they went in a 12" group at 545yds, tried some 250 SGK and they went in a
6" group, tried some 300 SMK and they went into a 3" group. Yes the little .243 will be tested by wind! I shoot a 6/06 AI and have killed dozens of southern white tail deer with it. The effective range of my loads would not exceed 450 yds. on a good day(killing big game).