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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Scope - bore measurement
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<blockquote data-quote="Kevin Cram" data-source="post: 208795" data-attributes="member: 2215"><p>The center of bore to center of scope measurement is not super critical but does play an effect. For instance a 6.5mm 140g A-Max traveling 3000fps at an altitude of 1500 with a center of bore to center of scope distance of 2 3/4" with a 100 yard zero has a drop value of 24.4 moa at 1000 yards and 99.6 at 2000 yards. Now if all we change is the sight height to say 3", the drop value of the same bullet at 1000 yards is 24.2 moa and 2000 yards is 99.4 moa. A mere 1/4 moa. So you should be able to measure center of bore to center of scope with using a ruler and come very close without it making a huge difference.</p></blockquote><p></p>
[QUOTE="Kevin Cram, post: 208795, member: 2215"] The center of bore to center of scope measurement is not super critical but does play an effect. For instance a 6.5mm 140g A-Max traveling 3000fps at an altitude of 1500 with a center of bore to center of scope distance of 2 3/4" with a 100 yard zero has a drop value of 24.4 moa at 1000 yards and 99.6 at 2000 yards. Now if all we change is the sight height to say 3", the drop value of the same bullet at 1000 yards is 24.2 moa and 2000 yards is 99.4 moa. A mere 1/4 moa. So you should be able to measure center of bore to center of scope with using a ruler and come very close without it making a huge difference. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Scope - bore measurement
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