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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ballistics Problem
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<blockquote data-quote="Bart B" data-source="post: 670282" data-attributes="member: 5302"><p>For what it's worth, there's more error in scope internal adjustment movement per click that most folks realize. One reason is the focal length of all the lens elements aren't exact to specs; they can easily vary 5%. Add them all up and 'tis easy to get more than a 5% error per click. The other reason's the mechanics are made close to exact specs stated, but they ain't exact for the distance between the adjustment contact point and where the lens tube pivots in the scope.</p><p></p><p>One needs to see exactly what their scope moves the reticule per click for reliable adjustments for range changes. And moving a few-shot group around a target ain't all that accurate unless you can shoot your rifle and its ammo into sub 1/10th MOA at 100 yards. Instead, put up a ruler at a known distance then clamp the scoped rifle in something to hold it scope steady on the ruler. Move the scope 10 major units (MOA, mils, etc) and see how far the reticule moves in inches on the ruler. Then use grade school math to figure out exactly how much per click the reticule moved.</p><p></p><p>The only scopes that are exact are the old Lyman, Fecker, Litchert, Unertl, El Monte and Remington externally adjusted ones. With bases exactly 7.200 inches apart, their 40 tpi threaded adjustments with 50 clicks per turn moved the scope tube exactly .000500" per click at the adjustment flat; exactly 1/4 inch per hundred yards or 1/4 traditional MOA per click. Folks wanting the adjustments in trig MOA (1.0472 inch at 100 yds) would have the bases spaced at 6.875 inches.</p></blockquote><p></p>
[QUOTE="Bart B, post: 670282, member: 5302"] For what it's worth, there's more error in scope internal adjustment movement per click that most folks realize. One reason is the focal length of all the lens elements aren't exact to specs; they can easily vary 5%. Add them all up and 'tis easy to get more than a 5% error per click. The other reason's the mechanics are made close to exact specs stated, but they ain't exact for the distance between the adjustment contact point and where the lens tube pivots in the scope. One needs to see exactly what their scope moves the reticule per click for reliable adjustments for range changes. And moving a few-shot group around a target ain't all that accurate unless you can shoot your rifle and its ammo into sub 1/10th MOA at 100 yards. Instead, put up a ruler at a known distance then clamp the scoped rifle in something to hold it scope steady on the ruler. Move the scope 10 major units (MOA, mils, etc) and see how far the reticule moves in inches on the ruler. Then use grade school math to figure out exactly how much per click the reticule moved. The only scopes that are exact are the old Lyman, Fecker, Litchert, Unertl, El Monte and Remington externally adjusted ones. With bases exactly 7.200 inches apart, their 40 tpi threaded adjustments with 50 clicks per turn moved the scope tube exactly .000500" per click at the adjustment flat; exactly 1/4 inch per hundred yards or 1/4 traditional MOA per click. Folks wanting the adjustments in trig MOA (1.0472 inch at 100 yds) would have the bases spaced at 6.875 inches. [/QUOTE]
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Ballistics Problem
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