The Sig Sauer SIERRA3BDX 3.5-10x42 riflescope brings connected ballistics to the hunting field. Pair it with a BDX-capable rangefinder—like Sig's own KILO series—and the scope's digital holdover dot automatically calculates and displays the exact aiming point based on range, environmental conditions, and your rifle's ballistics. It's rifle scope technology that does the hard math so you can focus on the shot. The SIERRA3BDX bridges the gap between traditional reticle hunting and modern precision, without the learning curve of manual hold calculations.
Built into the 30mm tube is a second focal plane reticle paired with an OLED-illuminated digital ballistic dot on the Digital Focal Plane. That illuminated dot automatically scales with magnification, so it subtends correctly whether you're glassed in at 3.5× or zoomed to 10×. Sig's SpectraCoat lens coatings maximize light transmission across the visible spectrum, delivering the brightness and clarity hunters need in low light. The scope is waterproof to IPX-7 (fully submersible to 1 meter) and fog-proof—rugged enough for the backcountry and reliable in harsh weather.
Smart features include MOTAC (Motion Activated Illumination), which powers the digital reticle only when it detects movement, preserving battery life in the field. LevelPlex digital anti-cant monitoring helps ensure your rifle is level on the shot. The KinETHIC kinetic energy indicator—controllable via the Sig BDX App—lets you monitor whether your cartridge still delivers sufficient energy on distant targets, supporting ethical hunting decisions. 0.25 MOA adjustments give you the precision needed for long-range work, while the 3.5-10× magnification range handles everything from 100-yard brush shooting to extended-range hunts.
This is a scope built for hunters who want cutting-edge ballistics technology without the complexity of traditional external milling or manual calculation—as long as you commit to the BDX system as a whole.
| Magnification | 3.5-10× |
| Objective Lens Diameter | 42mm |
| Tube Diameter | 30mm |
| Reticle Type | Digital OLED on Digital Focal Plane; second focal plane stadia |
| Adjustment Increment | 0.25 MOA |
| Ballistics System | BDX-R1 Digital (requires compatible BDX rangefinder) |
| Waterproof Rating | IPX-7 (1 meter immersion) |
| Finish | Black |
| Lens Coatings | SpectraCoat |
The SIERRA3BDX works with BDX-capable Sig Sauer rangefinders. The two devices communicate via Bluetooth; the rangefinder measures distance and relays it to the scope, which calculates and illuminates the holdover dot based on your rifle's ballistic profile and environmental data stored in the Sig BDX App.
Yes. The app is used to set up your rifle's ballistics, configure the KinETHIC energy thresholds, and manage the BDX system. Without it, the scope functions as a fixed magnification optic with an illuminated reticle, but you lose the automatic ballistic calculation feature.
The scope will still work as a standard riflescope with magnification, illumination, and manual holdover capability. However, the primary advantage—automatic holdover via the digital dot—requires a compatible BDX rangefinder paired via Bluetooth.
Yes. The 3.5-10× magnification, 0.25 MOA adjustments, and integrated ballistics system are designed to support extended-range hunting. The automatic holdover feature and KinETHIC energy monitoring are particularly useful for shots beyond typical hunting distances.
Sig Sauer
Sig Sauer
Sig Sauer
