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Posted: 3/13/2003 4:40:06 PM EDT
| zeroed with small aperture today at 50 yds.when i changed to the large one,the zero moved 2 ins. left and 2 ins. down. this normal? |
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The rear sight has 36 threads per inch. The sight radius on a 16" barrel is 14.75". Rotating the sight 1/4 turn will move point of impact by 1.7" at 100 yards (1.25" with a 20" barrel) changing from large to small hole will shift the point of impact to the right. You should zero the rifle with the small apperature. |
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Measured, and the smaller aperture was about .003" too far to the left. I corrected it with a Swiss needle file, will test fire and report. ops Edited to add: Zero for windage is now dead center for both apertures. There is apparently about 3 MOA difference in elevation, which works for a 100 to 300 yard zero. Ops |
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The two sight apertures are supposed to be offset by the amount of movement caused by the quarter turn when you flip from one aperture to the other. They should NOT cause a windage change. There SHOULD be an elevation change when going from the 0-200 (large) to the 300 (small) aperture. Your fix, with the needle file, was the correct one. Apparently your rear sight blade was not correctly made. |
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