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Long Range Hunting & Shooting
Measuring scope height
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<blockquote data-quote="rscott5028" data-source="post: 534495" data-attributes="member: 24624"><p>It pays to be as precise as possible. But, you also have to keep things in perspective. </p><p> </p><p>You should be close enough if you measure from the centerline of the bore/bolt/firing pin to the centerline of the scope where the turrets are located. It may make it easier if you meaure top of the bolt to bottom of the scope and add half the scope diameter plus half the bolt diameter. </p><p> </p><p>Any such reasonable measurement should suffice as other shot to shot variables will present a bigger challenge for predicting POI at long range. </p><p> </p><p>e.g. 7RM+180 Berger @ 2600 fps</p><p>1.8" scope ht=317.1" drop @ 1k</p><p>1.3" scope ht=319.1" drop @ 1k</p><p>2" @ 1000 yds < 1/4 MOA (less than 1 click on most scopes)</p><p> </p><p>How much change in MV do you get with a 20 deg change in termperature from the particular powder that you use? </p><p> </p><p>What MOA accuracy can you depend on from your rifle? </p><p> </p><p>JMO</p><p>-- richard</p></blockquote><p></p>
[QUOTE="rscott5028, post: 534495, member: 24624"] It pays to be as precise as possible. But, you also have to keep things in perspective. You should be close enough if you measure from the centerline of the bore/bolt/firing pin to the centerline of the scope where the turrets are located. It may make it easier if you meaure top of the bolt to bottom of the scope and add half the scope diameter plus half the bolt diameter. Any such reasonable measurement should suffice as other shot to shot variables will present a bigger challenge for predicting POI at long range. e.g. 7RM+180 Berger @ 2600 fps 1.8" scope ht=317.1" drop @ 1k 1.3" scope ht=319.1" drop @ 1k 2" @ 1000 yds < 1/4 MOA (less than 1 click on most scopes) How much change in MV do you get with a 20 deg change in termperature from the particular powder that you use? What MOA accuracy can you depend on from your rifle? JMO -- richard [/QUOTE]
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Measuring scope height
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