How to Use BDX Riflescopes and Rangefinders
The SIG SAUER BDX system integrates KILO rangefinders and SIERRA3BDX riflescopes with a smartphone app for automated ballistic calculations. It offers three usage modes: scope-only with pre-set dots, rangefinder-only with app calculations, or the full system for automatic holdover data transmission to the scope's reticle. The system simplifies accurate shooting by providing real-time elevation and windage adjustments.









