First of all a lot the people that have replied to your post are giving you good info so heed it. I don't strongly sugguess making 500yrd shoots at big game because if you don't have a 500+ plus range in your back yard to practice in all kinds of different wheather situations you might not know how your firearm shoots... And I believe that we owe it to the game we hunt to humainly kill it not to take pot shots at it. So my advise to you would be to get a lot of ammo and practise if you are set on making 500yrd shots and get a good range finder because at that range the margin for era is very slim. Secondly make sure your rifle is up to the challengewith it's optics. Other wise keep your shots to 300yrds or less which is where over 80% of game is mostly taken. REMEMBER HUNTING IS ABOUT GETTING CLOSE ENOUGH TO THE ANIMAL TO KILL IT HUMAINLY NOT TO HAIL MERRY AND HOPE THAT YOU GET LUCKY!!! good luck on your hunt...