Number one thing is you have to take alot of things into account shooting long range. Altitude, cross winds, hold over, ect...

With my 270 I have it sighted in at 2" High at 100...You basically just square up on the animal and pull the trigger out to almost300yrds which is an oddity of a shot in the woods here in western PA. I have shot a few Doe out to almost 200 across a field, but 300yrds is a hell of a longshot.

1st thing to do probaly would be to banish that simmons scope from your gun and get yourself a quality set of optics if you want to shoot 500yrds.

Practice...just a thought...Ive never shot 500yrds nor wanted to. We had a 19 year old kid here take a shot at a deer here about a week ago he missed and it hit another hunter in the head killing him.....not a very smart idea no deer alive is worth another human beings life. IF YOU ARE NOT COMFORTABLE TAKING THE SHOT WITH THE CONFIDENCE TO PROVIDE A FAST CLEAN KILL TO THE ANIMAL YOU ARE HUNTING....DO NOT SHOOT!