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When shooting at a target 100 yards away, a 1 MOA group is a circle of approximately 1.047 inch diameter, [8] roughly the size of a dollar coin.
It is especially popular as a unit of measurement with shooters familiar with the imperial measurement system because 1 MOA subtends a circle with a diameter of 1.047 inches (which is often rounded to just 1 inch) at 100 yards (2.66 cm at 91 m or 2.908 cm at 100 m), a traditional distance on American target ranges.
For reference a 1 MOA circle at 100 yd (91 m) has a diameter of 1.047 in (2.7 cm), 3 in (7.6 cm) at 100 yd (91 m) equals 2.9 MOA, and 5 in (12.7 cm) at 100 yd (91 m) equals 4.8 MOA In summary the accuracy standards of the Gewehr 98 and most other service rifles used in World War I and later were similar.
The sights move in the vertical and horizontal planes in fixed increments of (typically) 1/4 minutes of angle (MOA); as a rule of thumb, moving the sight by 1 MOA moves the impact of the shots by 1 inch (25 mm) per hundred yards distance of the target from the rifle.
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The most commonly seen click values are 1 ⁄ 4 MOA (often expressed in approximations as "1 ⁄ 4 inch at 100 yards") and 0.1 mil (often expressed as "10 mm at 100 meters"), although other click values such as 1 ⁄ 2 MOA, 1 ⁄ 3 MOA or 1 ⁄ 8 MOA and other mil increments are also present on the commercial and military and law enforcement ...
Cooler-than-average water temperatures in the equatorial Pacific Ocean are still expected to reach the criteria for a weak La Niña by the end of January, according to an updated outlook released ...
2.91 cm 1.15 in 1.047 in 1 mrad 3.438′ 1 mrad 100 mm 10 cm 3.9 in 3.6 in Exact ...