Choosing the right rifle scope can be overwhelming, especially when you’re faced with numbers like 3-9×40 or 4-16×50. But understanding these scope numbers is the first step to making an informed purchase.
A scope labeled 6-24x offers an even wider range. At 6x, it works well for mid-range targets. At 24x, you are using high magnification. This is great for long-distance shooting, such as prairie dog hunting or hitting steel targets beyond 600 yards.
The first part of a scope number refers to magnification. For instance, a 3-9×40 scope means the image can be magnified between 3 to 9 times its actual size. The higher the first number, the greater the zoom. Variable scopes like this give shooters flexibility based on range and target size. Fixed scopes, such as a 4×32, maintain a single magnification setting, offering simplicity and usually a lighter design.
The second number after the “x” indicates the objective lens diameter in millimeters. A 40mm lens, for example, gathers more light than a 32mm, which typically means a brighter image, especially in low-light conditions. However, larger lenses may require higher mounting and add weight.
Understanding eye relief, field of view, and exit pupil also helps maximize scope performance. Eye relief is the distance your eye needs to be from the scope to get a full view without black edges. Field of view (FOV) is how wide an area you can see at a particular distance—important for tracking moving targets. Exit pupil size affects brightness and ease of use in dim environments.
When in doubt, always refer to the full Scope Numbers Explained guide to ensure your scope fits your hunting or shooting needs.
