The Sig Sauer SIERRA3BDX 2.5-8x32 30mm riflescope brings precision and simplicity to the hunt by pairing optical excellence with digital ballistic intelligence. Built for hunters, shooters, and crossbow users who demand accuracy without complexity, this compact scope integrates Sig's BDX (Ballistic Data Xchange) technology—a system that works with compatible Sig rangefinders to automatically place a holdover dot exactly where your bullet or bolt will go. Once you range your target and confirm sight picture, the rest is straightforward: aim and shoot.
What sets the SIERRA3BDX apart is its commitment to ethical hunting and operational practicality. The KinETHIC kinetic energy indicator helps you stay confident that your shot has the energy to ethically harvest game—you set the threshold through the Sig BDX App, and the scope signals when energy on target drops below that level. Motion-activated illumination (MOTAC) powers the reticle only when you move, preserving battery life and ensuring you're ready when the moment matters. Auto LevelPlex adjusts digital level sensitivity automatically on longer shots, removing guesswork from angle-dependent holdovers.
Optically, the SIERRA3BDX doesn't compromise. SpectraCoat lens coatings minimize reflections across the visible spectrum, delivering superior light transmission in low-light conditions—critical for dawn and dusk hunting. The scope is waterproof to IPX-7 (full immersion to 1 meter) and fog-proof, built to survive the elements. Its 2.5–8x magnification and 32mm objective lens strike a practical balance: enough reach for mid-range work without the bulk that makes lightweight rifle builds unwieldy. The 30mm tube accepts standard rings, and 0.25 MOA adjustments give you the precision to dial in exact zero.
The BDX system itself pairs this scope with Sig rangefinders that support the platform—via Bluetooth and the Sig BDX App, ballistic data, environmental conditions, and your firearm or crossbow profile sync seamlessly to calculate and display the right holdover dot. That same app now supports crossbow ballistics entry, letting you input bolt weight and velocity for fully customized holdover solutions.
| Brand | Sig Sauer |
| Model | SIERRA3BDX |
| Magnification | 2.5–8x |
| Objective Lens Diameter | 32mm |
| Tube Diameter | 30mm |
| Adjustment Increment | 0.25 MOA |
| Reticle Type | OLED BDX Digital (Digital Focal Plane) |
| Waterproof Rating | IPX-7 (1 meter immersion) |
| Fog-proof | Yes |
| Finish | Black |
The SIERRA3BDX integrates with Sig Sauer rangefinders that support BDX technology. The system uses Bluetooth to pair your scope with a compatible rangefinder, syncing ballistic data and environmental conditions to display the exact holdover dot on the reticle. Check with Sig Sauer to confirm which rangefinder models are compatible with this scope generation.
Yes. The scope is designed for ultra-lightweight rifle, shotgun, muzzleloader, and crossbow configurations. The Sig BDX App includes crossbow ballistic profiles—you can enter your bolt weight and speed to generate a custom holdover solution specific to your crossbow setup.
KinETHIC is a kinetic energy transfer indicator that helps you make ethical shots. You set a minimum energy threshold using the Sig BDX App based on the game you're hunting. As distance increases, the scope's ballistic calculation accounts for energy loss, and the indicator signals when your remaining energy on target falls below your preset threshold—helping you avoid marginal shots.
The product information provided does not specify whether mounts or rings are included. Contact us to confirm what's in the box and what mounting hardware you'll need for your rifle.
Sig Sauer
Sig Sauer
Sig Sauer
