Had a very successful cow elk hunt on the Mescalero Indian reservation last week. Shot my cow on the last evening of the hunt. The shot was uphill (15-20 degrees maybe) I ranged the cow at 534 yards. I set my scope to 8.5 which was 550 yards. I hit perfect height just a little far back. Bullet went in at the last quarter of the ribs thru the liver and out the gut. She ran about 80 yards. A fellow hunter is telling me that my distance was bogus because I didnt use the angle of incline. So my distance to figure my MOA adjustment was bogus. So he's saying - lucky shot. I hit where I was aiming - just left? What do you think? Rangefinder - Leica 1200 gun - 300 remington ultra mag - bedded,ported, trigger job yadda yadda yadda..supersniper scope.