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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Accuracy At Different Ranges
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<blockquote data-quote="Bart B" data-source="post: 93171" data-attributes="member: 5302"><p>Sambo3006, a trig minute of angle at 100 yards is 1.0472 inches. But a shooting minute of angle at 100 yards is exactly 1 inch. That was decided many years ago when sight radius on most target rifles was 30 inches and a 40 thread per inch lead screws in the rear sight was standardized. One turn on the windage or elevation knob moved the sight .025-inch; one-third turn moved it .008333 inch. 30 inches divided by 3600 (number of inches in 100 yards) equals .0083333-inch.</p><p></p><p>Most USA NRA smallbore and highpower rifle targets have scoring ring diameters based on this axiom as does most US made aperture rear sights' adjustments.</p></blockquote><p></p>
[QUOTE="Bart B, post: 93171, member: 5302"] Sambo3006, a trig minute of angle at 100 yards is 1.0472 inches. But a shooting minute of angle at 100 yards is exactly 1 inch. That was decided many years ago when sight radius on most target rifles was 30 inches and a 40 thread per inch lead screws in the rear sight was standardized. One turn on the windage or elevation knob moved the sight .025-inch; one-third turn moved it .008333 inch. 30 inches divided by 3600 (number of inches in 100 yards) equals .0083333-inch. Most USA NRA smallbore and highpower rifle targets have scoring ring diameters based on this axiom as does most US made aperture rear sights' adjustments. [/QUOTE]
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