I'm sure this topic has been covered before. I'm new to long-range I've always used regular cross hair scopes and bdc, The thing I'm having a hard time understanding is, for argument sake the rifle is sighted in at 100yds and I want take a shot at 600 yds now I know the bullet drops 30" at that range would I have have go up 30". The moa on my scope is 1/4" would that mean I'd have to go up 120 clicks. Any help would be greatly appreciated.