Sig Sauer Sierra3bdx 4.5-14X50 Review: A Complete Hunting Package!

Si Sauer Sierra 3 BDX is a complete hunting package. Tonight, I won’t be reviewing the complete package, but rather a part of that package. What is this package? In the BDX series, you will find a riflescope, a BDX rangefinder, and a smartphone app. That’s right, you will have a smartphone app to connect your rangefinder and riflescope. 

You won’t find an app for most other riflescopes. In this Sig Sauer 4.5-14×50 review, I will try to explain every nook and cranny of this scope and why the app makes it so special. All you have to do is, sit down, relax, and enjoy the stay.

Sig Sauer Sierra3bdx 4.5-14X44: Outlooks

Sig Sauer Sierra3bdx 4.5-14x44

Specifications | Magnification: 4.5 – 14x; Objective Lens: 50 mm; Eye Relief: 1.5 – 3 Inches; Exit Pupil: 11 – 3 mm; Linear FOV @100 yds: 19.9 – 6.7 ft; Length: 17 Inches; Weight: 3 Pounds.

What Is BDX

BDX is not a single thing. It’s a combination of 3 different things. A riflescope, a laser rangefinder, and a smartphone app. The app is built to complement and unleash the full potential of the riflescope. Yes, you can use them separately. But they do complement each other.

Build Quality

Sig Sauer didn’t disappoint me in this area. The build quality is as I expected from them. Made out of durable aluminum, it has a sturdy finish to it. On the outside of the scope, it’s coated with a matte black finish. Giving the scope a threatening aura and a different outlook.

This rifle scope was made for your AK and AR-15s. You can pair it with a sniper, but Sig Sauer recommends you use it with an AR to get the best result. 

Sierra3BDX also has an IPX-7 rating. You can submerge this underwater up to 1m. That doesn’t mean you should. It’s there so you can use the scope under the rain.

Lens Quality

Sig Sauer uses ED and HT glass. ED glass stands for extra-low dispersion while HT stands for high transmittance. Together, they provide excellent optical performance. The image is so vivid and clear, that you will be mesmerized by the quality of these pictures.

The objective lens is quite big. 50mm objective lens gathers plenty of light for the scope to work with. ED glass doesn’t need much light to work with, while HT glass transmits all of the light for the scope to work with. A perfectly balanced combination to nail the visual performance.

The coating is called SpectraCoat. It’s an ultra-wide broadband anti-glare coating system. Better than fully multi-coating. It completely eradicates glares. You won’t see them again. Not with this scope. 


The base magnification of this scope is 4.5x. That’s like the same as a tactical riflescope. The max magnification is 14x. Despite having a mid-range magnification setup, Sierra3BDX can easily shoot up to 800 yards.

After syncing with the rangefinder inside the app, you can find the distance between you and the target inside the app. This range is impressive and commendable. 


Sierra3BDX comes with a BDX-R1 Digital illuminated reticle. For some reason, taking pictures of this reticle seems like the hardest job in the world. The illumination and lines do not seem to play well with cameras.

But when you look through the eyepiece, you will be greeted with a minimal reticle that offers all the necessities of a hunting riflescope. You will find windage and elevation readings, alongside bullet drop compensation to work with. 

Instead of using the reticle to calculate the bullet drop, you can always let the app do that job for you. Life is easier in that way. The reticle is in the second focal plane. Yes, it’s a bit disappointing. But not that much. It makes up in that department with unmatchable performance. 

I have to nitpick something about this reticle. The brightness seemed low to me. It could have been a bit higher. Finding the dots under the bright sun is troublesome. Besides that, everything else about this scope seemed golden to me. To power up the illumination, you will need two CR2032 batteries. Sig Sauer includes that inside the package.

What Makes The Sig Sauer BDX Unique?

This scope is not a digital night vision riflescope. That’s why the eyepiece is not a display. Rather a regular eyepiece made out of glass. There is nothing wrong with that, I am just saying that to provide context.

BDX stands for Ballistic Data Xchange. To use this feature, you need to download the Sig BDX app. Inside the app, you will find options to pair your sight or your rangefinder. You need to sync the rangefinder with the app. 

After that, you need to press the button to calculate the distance of the target. You are doing this to save the information of the rangefinder. In the next step, you are going to bond the rangefinder and the riflescope together.

Now you understand why I said they are a complete package? One of them completes the other. Perfectly balanced, as all things should be. 


  • Good build & lens quality.
  • Smooth magnification experience.
  • BDX & Well App support.
  • SpectraCoat fully multi-coated lenses.
  • IPX-7 water and dustproof rating.
  • HDX optical system.
  • Multiple illuminated reticle options to choose from.
  • 800 yards of range.


  • Incomplete without the rangefinder.
  • Second focal plane reticle.

Sig Sauer Sierra3bdx 4.5-14X50 Review Summary

The sheer number of pros easily outnumbers the tiny amount of cons. Among those tiny cons, there is one that can be a dealbreaker for you. If you are looking for a first focal plane reticle, this is not the sight for you.

If you are okay with second focal plane reticles, then this can be an excellent choice for you. Keep in mind, sooner or later you have to buy the rangefinder to pair this up with.

I know what you are thinking, why do I need a rangefinder? Rangefinders are excellent for long-range hunting. If you know the distance between you and the target already, you can easily compensate for the bullet drop.

With that said, I have to end the Sig Sauer 4.5-14×50 review here. I hope you had a good time and enjoyed reading this. If you have any questions left or want any sort of help. Don’t forget to write them down in the comments. I will be more than happy to help you out. 

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