Interesting question, Bob. In the majority of hunting situations,especially out west, I'd wager most couldn't dope the wind accurately across a valley, whether the valley is in Colorado, Texas or Pennsylvania, lack of 'wind flags' would really put the hurt on any estimations.
I notice on some of the videos, they appear to be shooting in very little-to-no winds. Lucky them. Try that same shot with an unknown cross-wind swirling up and/or down and/or across the canyon and let's see your targets then?
Personally, with a good rest I feel good out to 350-400 with the 243. about 50 yards further with the 264 and about the same as the 243 with my 25-06's. Across a canyon though? I'll pass most any shot inside of 400 and many times, inside of 300. As XPHunter said "It Depends..."
