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<blockquote data-quote="westcliffe01" data-source="post: 1557084" data-attributes="member: 35183"><p>The right way to do this is go to your dog town, put out a target level with shooting position ranged at 100 yards. Verify that scope point of aim = point of impact. Move the target to 200 yards. Leave scope as is. Shoot again. Measure actual bullet drop vs point of aim. Move target to 400 yards. Repeat the exercise. Might have to add some extra paper below target to account for bullet drop. Measure actual drop at 400 yards. </p><p></p><p>Now enter your data into a ballistic calculator. If you use the G7 coefficient from applied ballistics, then at least that should be fairly accurate. Make sure temperature and elevation match the shooting location and that 100 is specified as zero. Now calculate the bullet drop and wind drift for a 10mph left to right wind. Specify distance increments of 50 yards since you dont need a table a foot long. Now compare the 400 yard drop data. If your actual drop is more than the calculator, 99% of the time its because your muzzle velocity is not what is printed on the box. </p><p></p><p>Go back into the ballistic calculator and start dropping the MV by 50fps. Re- run the drop table, re-check the 400 yard drop. Keep doing this till the numbers match at 400. You should find the numbers to be pretty good at 200 at this point. The 200 drop is a sanity check. </p><p></p><p>Format the drop table like you want it and print it off. Write your parameters on it with a sharpie (BC and MV zero distance and temp).</p><p></p><p>In my opinion, since you are not shooting a 22lr, the drop between 100 and 400 yards is not going to be that much. Probably less than 1/2 a turn on the turret. It would be even less if you zeroed at 150 yards. I dont like to zero at 200 or 250 because if you need to take a shot at 100 you have to hold low and I find that a bit counter intuitive.</p><p></p><p>When dialing, remember that when changing direction, go past the intended point and then dial back up to the desired number. Everything has a bit of backlash in it, so if you approach your target value always going up, it will never be an issue.</p></blockquote><p></p>
[QUOTE="westcliffe01, post: 1557084, member: 35183"] The right way to do this is go to your dog town, put out a target level with shooting position ranged at 100 yards. Verify that scope point of aim = point of impact. Move the target to 200 yards. Leave scope as is. Shoot again. Measure actual bullet drop vs point of aim. Move target to 400 yards. Repeat the exercise. Might have to add some extra paper below target to account for bullet drop. Measure actual drop at 400 yards. Now enter your data into a ballistic calculator. If you use the G7 coefficient from applied ballistics, then at least that should be fairly accurate. Make sure temperature and elevation match the shooting location and that 100 is specified as zero. Now calculate the bullet drop and wind drift for a 10mph left to right wind. Specify distance increments of 50 yards since you dont need a table a foot long. Now compare the 400 yard drop data. If your actual drop is more than the calculator, 99% of the time its because your muzzle velocity is not what is printed on the box. Go back into the ballistic calculator and start dropping the MV by 50fps. Re- run the drop table, re-check the 400 yard drop. Keep doing this till the numbers match at 400. You should find the numbers to be pretty good at 200 at this point. The 200 drop is a sanity check. Format the drop table like you want it and print it off. Write your parameters on it with a sharpie (BC and MV zero distance and temp). In my opinion, since you are not shooting a 22lr, the drop between 100 and 400 yards is not going to be that much. Probably less than 1/2 a turn on the turret. It would be even less if you zeroed at 150 yards. I dont like to zero at 200 or 250 because if you need to take a shot at 100 you have to hold low and I find that a bit counter intuitive. When dialing, remember that when changing direction, go past the intended point and then dial back up to the desired number. Everything has a bit of backlash in it, so if you approach your target value always going up, it will never be an issue. [/QUOTE]
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