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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 $69.95 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 This is your order if you have recorded the required amount of click (moa) adjustment for your bullet's drop from a 100 or 200 yd zero to your desired maximum range. We will calibrate a TTC knob in 50 or 100 yard increments based on the data you provide. Select the type of yardage format to be used. See TTC #1 for available scope models. Laser Engraved Knob $79.95