scope question?
Ok my dad has bought all my scopes to the date (im 20) the guns i've been using to hunt with the scopes was bought before i was old enough to work. But i was out looking at scopes for my new gun and seen a bushnell 4-12x40 with a deal u turn at the end of the scope that had like 50,100 and so on yards on it. how do u use that and was is it for.The scopes i used was plain 3-9x40 without that peoples told me its for shooting long distance do u leave it on 50 to sight your gun in? anyinfo will help ROD