I think some have misinterpreted my posts or I've not written them clearly. It is my point to say that beyond 400 yards as asked by parts man, was that there are many varibles that influence a bullets trajectory so that it is extremely difficult to accurately predict the bullets impact. Wind drift, miss guessed distance, temperature affecting chrono velocity on the day of hunt, bullet drop, and animals movement during time of flight. Yes, one can practice and train himself to shoot accurately at this range. Yes, one can use a quality range finder to determine distance. Yes, using a pet load will reduce errors outside of target intended. If I'm capable of shooting a deer at 400 yards, will I walk away from one at 410 yards; NO. This is not a bright line barrier. I do a lot of shooting from a boat with it moving constantly. I defy all those 500 yard shooters to hit a target at 300 yards from a boat, if you haven't ever practiced from one. A rest does you no good, as the rest is moving with the boat in directions that cannot be compensated for by moving the rifle. The range varies as the boat moves, so a range finder is not going to do much good. The wind blows almost constantly across water in gusts, rather than steady breezes and is almost impossible to determine what it is doing at 500 yards. These effects are also prevalent on land hunting. Almost all of the time, when you see game at 500 yards, they can be shot much closer with a bit of hunting effort and reduce those variables to acceptable limits.