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We offer three unique custom orders designed to meet the needs of all shooters. TTC #1 Standard Factory ammunition More Selections Replace the target knob on your riflescope with a TTC calibrated per your order. Select the type of yardage format to be used. Choose an altitude setting which falls within your altitude range and an average field temperature. Laser Engraved Knob $89.95 TTC #2 Handloaders, wildcatters, or any specific calibration. A TTC knob is calibrated out to the maximum effective range of your cartridge based on bullet type, muzzle velocity, altitude, and temperature. Select the type of yardage format to be used. See TTC #1 for available scope models. Laser engraved knob $89.95 TTC #3 Personal Field Data Select this order form if you have recorded the required amount of click (or moa) adjustment for your bullet's drop starting from a 100 or 200 yd zero. A TTC knob will be calibrated based on the click or moa you provide for each 50 yard increment. Select the type of yardage format to be used. See TTC #1 for available scope models. Laser Engraved Knob $79.95