The Custom Ballistic Turret (BT) allows the hunter to have a pre-determined zero and set of down range distances engraved on the turret. Once set up, you simply turn the turret to the appropriate down range distance, so you can hold the crosshair precisely where you want the bullet to hit. To get back to your zero setting, simply turn the turret back where it will automatically stop at your pre-set zero setting. The shooter will still have to accurately determine distance to the target (as with a laser range finder), and account for wind when necessary.
Tom Hogan, of SWAROVSKI OPTIK NORTH AMERICA says, "The SWAROVSKI OPTIK BT Turret system has become extremely popular and is now offered on the Z6(i), Z5 and Z3 series rifle scopes. The addition of the optional Custom BT with 50 yard increment settings, has now upgraded the versatility of the BT system to allow a hunter to make long range shots with greater precision and confidence."
In order to obtain the Custom Ballistic Turret, you can order one by calling SWAROVSKI OPTIK'S Customer Service Department at 800-426-3089 and supplying them with all cartridge/load data.