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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Scope Turret Calibration
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<blockquote data-quote="D.Camilleri" data-source="post: 1204903" data-attributes="member: 2567"><p>I finally got out to shoot long range last night with my new barrel on my 338 rum. I was doing well at 690 yards, and since no one else was at the range, I went to the far birm and shot 986 yards. I had good paper on a 4x8 piece of plywood and thought I had good dope. I ranged the target with my G7 range finder and my balistic solution was 23 moa. My load is 300 gr berger otm @2800 fps. I took two shots and went to check the target. No holes! I looked very carefully and finally found one fresh hole in the plywood at the extreme top of the board above my paper. The impact was about 20 inches high. I went back and dialed 22 moa and took two more shots. 4 inches apart but still about 10 inches high. This doesn't match any of my drop charts!</p><p></p><p>This morning I took my rifle back out to the range and set the gun in a rest. I placed a tape measure on the plywood target at 100 yards. I aligned my cross hairs with the top of the plywood and zeroed the scope. I dialed 4 complete revolutions with my Sightron SIII and each 15 moa revolution moved right at 16 inches on my tape measure. 4 revolutions moved 48 inches.</p><p></p><p>So my question is how do I compensate for this variance? Using the G7, I can only compensate by changing the value for velocity. By changing from 2800 fps to 2900, it gets me close. </p><p></p><p>In my shooter app on my phone, I made a turret adjustment from .25 to .265 per click and it is also close. I now need to shoot to verify, maybe tonight when everyone else leaves the range.</p><p></p><p>Am I on track or should I do something different?</p></blockquote><p></p>
[QUOTE="D.Camilleri, post: 1204903, member: 2567"] I finally got out to shoot long range last night with my new barrel on my 338 rum. I was doing well at 690 yards, and since no one else was at the range, I went to the far birm and shot 986 yards. I had good paper on a 4x8 piece of plywood and thought I had good dope. I ranged the target with my G7 range finder and my balistic solution was 23 moa. My load is 300 gr berger otm @2800 fps. I took two shots and went to check the target. No holes! I looked very carefully and finally found one fresh hole in the plywood at the extreme top of the board above my paper. The impact was about 20 inches high. I went back and dialed 22 moa and took two more shots. 4 inches apart but still about 10 inches high. This doesn't match any of my drop charts! This morning I took my rifle back out to the range and set the gun in a rest. I placed a tape measure on the plywood target at 100 yards. I aligned my cross hairs with the top of the plywood and zeroed the scope. I dialed 4 complete revolutions with my Sightron SIII and each 15 moa revolution moved right at 16 inches on my tape measure. 4 revolutions moved 48 inches. So my question is how do I compensate for this variance? Using the G7, I can only compensate by changing the value for velocity. By changing from 2800 fps to 2900, it gets me close. In my shooter app on my phone, I made a turret adjustment from .25 to .265 per click and it is also close. I now need to shoot to verify, maybe tonight when everyone else leaves the range. Am I on track or should I do something different? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Scope Turret Calibration
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