I am looking for a scope for long-range shooting. There are several scopes on the market with bullet drop compensating (BDC) reticles. I am trying to decide if I want one of these (like the B&C offered by Leupold) or if a calibrated elevation turret (marked with appropriate ranges for a particular load) is a better way to go. Anyone care to weigh in?

Are aftermarket turrets available for the Zeiss Conquest series scopes?