With a 10 mph crosswind a 150 gr Nosler Partition bullet drifts 12. 3 inches(270)
a 180 gr in a 300 Weatherby mag drifts 10 inches and 11.5 inches with a 300Win mag( This is at 400 yards and for all purposes they are pretty close.
But here lies a big problem. How much crosswind is in the middle of that canyon?
But I have no idea of the winds in your area, but something to consider..