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Leveling the Scope Reticle for Long Range Rifles
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<blockquote data-quote="paphil" data-source="post: 774170" data-attributes="member: 17745"><p>Yes , the scope itself is canted left( counterclockwise) and with the scope in that position, the level is installed reading level. It is about a half a bubble off plumb! This can be done in the shop with a gun or scope vice and a vertical line about 25 yards away(far enough to get a focused image with the scope. Make a vertical line with a carpenters level. Now, I calculate the value of 2.5 degrees at a height of 24 inches. At this height, one degree is about .42 inches so 2.5 degrees is about one inch.( formula pii X diameter in inches divided by 360 degrees) Now, from a point, on the line measure up 24 inches and left 1 inch and connect the two points. Now, with the scope/gun in a vice, allign the scope with the canted line and install the level on the scope. The scope is tilted 2.5 degrees and the level stays level. It would be easier if the level screws were on the top instead of the bottom! The next step is getting the gun held in a comfortable position and then rotating the scope and level untill the horizontal is affirmed by the level. This is a custom set up for those that find it difficult to keep the gun from canting as indicated by the level. Most guns I do are level and square and the shooter must make those adjustments as he sees fit. Some don't want to pay that extra $50.00 for a level but it will make all the difference in the world! One word about spin drift, with the 2.5 degrees cant, on the 100 yard target, 1000 yards of elevation is 23 moa and 1500 yards is 51 moa so it is allowing almost 30 inches for spin drift at 1500 yards while only 10 inches at 1000. It is hard to get completly calm conditions to test, but to the best of my ability, this seems to work. another thing to remember is that after 1000 yards, everything goes south and all varibles are greatly increased and Coriolis must be allowed for. Hope this helps!</p></blockquote><p></p>
[QUOTE="paphil, post: 774170, member: 17745"] Yes , the scope itself is canted left( counterclockwise) and with the scope in that position, the level is installed reading level. It is about a half a bubble off plumb! This can be done in the shop with a gun or scope vice and a vertical line about 25 yards away(far enough to get a focused image with the scope. Make a vertical line with a carpenters level. Now, I calculate the value of 2.5 degrees at a height of 24 inches. At this height, one degree is about .42 inches so 2.5 degrees is about one inch.( formula pii X diameter in inches divided by 360 degrees) Now, from a point, on the line measure up 24 inches and left 1 inch and connect the two points. Now, with the scope/gun in a vice, allign the scope with the canted line and install the level on the scope. The scope is tilted 2.5 degrees and the level stays level. It would be easier if the level screws were on the top instead of the bottom! The next step is getting the gun held in a comfortable position and then rotating the scope and level untill the horizontal is affirmed by the level. This is a custom set up for those that find it difficult to keep the gun from canting as indicated by the level. Most guns I do are level and square and the shooter must make those adjustments as he sees fit. Some don't want to pay that extra $50.00 for a level but it will make all the difference in the world! One word about spin drift, with the 2.5 degrees cant, on the 100 yard target, 1000 yards of elevation is 23 moa and 1500 yards is 51 moa so it is allowing almost 30 inches for spin drift at 1500 yards while only 10 inches at 1000. It is hard to get completly calm conditions to test, but to the best of my ability, this seems to work. another thing to remember is that after 1000 yards, everything goes south and all varibles are greatly increased and Coriolis must be allowed for. Hope this helps! [/QUOTE]
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Leveling the Scope Reticle for Long Range Rifles
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