I agree with Judson for the most part. I have seen to many people shoot on the shiloutte range where the distance is known. You never know what the wind is doing all the way out to those extreme ranges. There is no way to practice changing winds whirl winds and air currents. There is no way to know if the deer may take a step or even lay down or turn directions. The bullet time in travel allows for to many variables. A poor hit on a target is no loss but we owe more to the game we hunt. One other question I have is why the hell take that kind of a shot? Is taking that deer at any range life or death? If conditions are real good and I know the range and the rifle, I might take a 300 yard shot. However unless a deer is already hit I don,t push the range. No deer is that important to me and I need not prove anything to anyone.