SIG Whiskey3 4-12x40 vs 4-12x50: Which Reticle to Pick?

Quick answer

Choose the SIG Whiskey3 4-12x40 BDC-1 if you want a simpler reticle for holdover at distance and a lighter front end. Choose the 4-12x50 Quadplex if you prefer a larger objective for low-light gathering and a straightforward duplex-style aim point.

Reticle choice: BDC-1 vs Quadplex

The 4-12x40 comes with the BDC-1 Quadplex reticle, which combines a duplex-style center with holdover marks for longer shots. The 4-12x50 uses a standard Quadplex reticle with a clean center and heavy outer posts. Neither is illuminated based on the supplied facts, so both rely on ambient light.

If you regularly shoot at distances where you need to hold over, the BDC-1 gives you reference points without dialing. If you prefer a simple, uncluttered view and mostly shoot inside point-blank range, the Quadplex is easier to ignore when you are not using the marks.

Objective size and light gathering

The 50mm objective on the 4-12x50 has a larger front lens than the 40mm on the 4-12x40. In practical terms, a larger objective can let in more light at the same magnification, which may help in low-light conditions. However, it also adds bulk and may require higher rings.

The 40mm version is more compact and sits lower on many rifles, which can improve balance and reduce the chance of the scope interfering with your cheek weld. If you mostly hunt in daylight or shoot at the range, the smaller objective is usually easier to carry and mount.

Adjustments and build

Both scopes share the same 3x optical zoom, second focal plane design, LD glass, European-style eyepiece, and IPX-7 waterproof and fog-proof rating. The 4-12x40 lists 0.25 M adjustments, while the 4-12x50 lists 0.25 MOA adjustments. That means the click values are different: the 40mm uses metric (0.25 mil) clicks, and the 50mm uses 0.25 MOA clicks.

If you already think in mils or use a mil-based reticle, the 4-12x40 is the consistent choice. If you prefer MOA, the 4-12x50 matches that system. Neither scope includes a stated illuminated reticle option in the supplied facts, so plan for daylight or available light use.

Trade-offs to weigh

• Reticle complexity vs simplicity: The BDC-1 on the 4-12x40 offers holdover marks for longer shots, but the extra marks can clutter the view for close-range work. The Quadplex on the 4-12x50 is simpler and faster to pick up for quick shots. Decide whether you will actually use holdover marks before choosing the BDC-1.
• Objective size and weight: The 50mm objective on the 4-12x50 may gather more light in low-light hunting, but it adds size and weight. The 40mm on the 4-12x40 is more compact and easier to mount low. If you walk long distances or want a low profile, lean toward the 40mm.
• Adjustment units: The 4-12x40 uses 0.25 M clicks, while the 4-12x50 uses 0.25 MOA clicks. Mixing these with a reticle that does not match can slow your corrections. Match the click unit to the system you already use for wind and elevation.

Product facts

• SIG WHISKEY3 SCOPE, 4-12X40MM, 1" BDC-1 QUADPLEX RETICLE, 0.25 M: 4-12x40mm with BDC-1 Quadplex reticle and 0.25 M adjustments. The BDC-1 reticle gives holdover references, and the metric clicks suit shooters who think in mils.

  

• SIG WHISKEY3 SCOPE, 4-12X50MM, 1" QUADPLEX RETICLE, 0.25 MOA ADJ: 4-12x50mm with Quadplex reticle and 0.25 MOA adjustments. The larger objective may help in low light, and the MOA clicks match that measurement system.

  

Which scope fits your use

Best for

• Hunters who want holdover capability in a compact package
• Shooters who prefer metric (mil) adjustments

Not for

• Shooters who want the simplest possible reticle
• Those who need maximum low-light performance and prefer MOA