Finding the right size scope cover for your rifle scope is simply a matter of measuring and then cross-referencing the dimensions with the manufacturer, according to Butler Creek, a Montana company that has been making scope caps for most of its 90-year history.
Butler Creek product manager Will Hemeyer said that’s one of the most common questions they get: “How do I know what scope cap and scope cover, what size do I need to buy?”
Hemeyer explained there are three ways to measure to find the right size scope cap, but before you do, you’ll need to get a couple of things. You’ll need a pair of calipers or a ruler, and the Butler Creek sizing chart.
According to the instructions, you can do the first two at home. They require that you measure with calipers or a ruler.
If you measure with calipers, you just simply clamp them around the outside edges of the rifle scope housing. That means both the eyepiece and the objective. Hemeyer suggested using calipers will get you more precise measurements.
Measuring with a ruler is a two-step process. First, you trace both ends of the rifle scope on a piece of paper, and then you use the ruler to measure the diameter of each ring. While the ruler won’t be as precise as the calipers, Hemeyer said it’s a good approximation. However, if it falls between two sizes, you should select the smaller of the two.
Once the measuring is done, all you have to do is cross-reference the measurements with the sizing chart to find the correct size scope cover. The guide is organized by model and lists sizes for eyepiece and objective.
The third way Hemeyer suggested requires access to a Butler Creek chart that usually accompanies the scope caps inside of a retail store. With the chart, you match the scope to rings printed on the chart.
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