what is bdc scope
Guide to using. Nikon BDC Reticle. Instruction manual. . Thank you for choosing the Nikon BDC reticle riflescope / crossbow scope. The BDC reticle is designed to compensate for the trajectory of your firearm or crossbow. Regardless of the particular style. of BDC reticle you have, the position of the circles are based upon an average trajectory for some of the more popular projectiles and cartridges on the market based upon the intended use of the scope. itself.