I have a tip for anyone buying a rifle with a scope for the first time. In the past, I have tried all kind of shortcuts to zero in a scope and they do not work. The proper method is Zero at 25 yards, 50 yards, and 100 yards. A number of scopes have a scale or BDC(bullet drop compensator) for longer distant shots.If your scope just has cross hairs, you can get a trajectory drop chart on the internet. Example-a .223(AR15) will rise an inch and a half at 200 yards while a .308 stays flat. Considerable drop at long distance! Example- a .308 zeroed at one hundred yards will drop approximately 20 feet at one thousand yards.