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<blockquote data-quote="bgordon" data-source="post: 3919" data-attributes="member: 519"><p>I do the reverse of that to verify bullet BC.</p><p>Find a calm day and get the rifle zeroed in at 600 yards (for instance). Being off a bit doesn't cause problems, just make sure your group is low enough that the 100 yard group will still be on paper. Then, just go in to 100 yards and take a couple of shots, making sure to use the same aiming point as further out. Do NOT change your scope windage or elevation adjustments. Measure the actual VERTICAL distance from center to center of the two groups and that gives you the actual amount of moa to get from 100 to the longer distance. Don't measure the center to center distance, measure the vertical difference between the group centers. If you have also chronographed those particular shots you have the necessary information to determine the actual average BC for that distance. Plug the info into the software and out pops an extremely accurate chart to give come-ups for intermediate distances.</p><p>Then all you have to do is verify the information at a few distances. At least for 1000 yards and closer, this has worked superbly for me.</p><p>This past weekend the projected 1000 yard scope setting was within 1/2 moa of the actual settings. First sighter was a 9 at 8 oclock with a new load. If I had gotten the windage correct it would have given me an X.</p><p></p><p>This method is also good to verify if you have enough vertical adjustment to get to whatever maximum yardage you intend to shoot. Have a tall piece of paper at 100 yards and put an aiming dot in the very bottom. Do one shot to verify 100 yard zero, then adjust the scope vertical 5 moa at a time. Take a shot each 5 moa. When the scope runs out of vertical take a shot and measure the vertical distance between the top and bottom holes and you will have the maximum vertical adjustment the rifle will do with the setup. Quite often the scope adjustment will turn further than the crosshairs will actually adjust for, which is the reason for a shot every 5 moa. That way you can know when the scope actually runs out of adjustment. I had a cheap tasco scope one time that would turn several full turns past the last actual adjustment and caused me problems because I expected it would get to 1000, but in actuality it would only get to 550.</p><p></p><p>[ 01-15-2003: Message edited by: Bruce Gordon ]</p></blockquote><p></p>
[QUOTE="bgordon, post: 3919, member: 519"] I do the reverse of that to verify bullet BC. Find a calm day and get the rifle zeroed in at 600 yards (for instance). Being off a bit doesn't cause problems, just make sure your group is low enough that the 100 yard group will still be on paper. Then, just go in to 100 yards and take a couple of shots, making sure to use the same aiming point as further out. Do NOT change your scope windage or elevation adjustments. Measure the actual VERTICAL distance from center to center of the two groups and that gives you the actual amount of moa to get from 100 to the longer distance. Don't measure the center to center distance, measure the vertical difference between the group centers. If you have also chronographed those particular shots you have the necessary information to determine the actual average BC for that distance. Plug the info into the software and out pops an extremely accurate chart to give come-ups for intermediate distances. Then all you have to do is verify the information at a few distances. At least for 1000 yards and closer, this has worked superbly for me. This past weekend the projected 1000 yard scope setting was within 1/2 moa of the actual settings. First sighter was a 9 at 8 oclock with a new load. If I had gotten the windage correct it would have given me an X. This method is also good to verify if you have enough vertical adjustment to get to whatever maximum yardage you intend to shoot. Have a tall piece of paper at 100 yards and put an aiming dot in the very bottom. Do one shot to verify 100 yard zero, then adjust the scope vertical 5 moa at a time. Take a shot each 5 moa. When the scope runs out of vertical take a shot and measure the vertical distance between the top and bottom holes and you will have the maximum vertical adjustment the rifle will do with the setup. Quite often the scope adjustment will turn further than the crosshairs will actually adjust for, which is the reason for a shot every 5 moa. That way you can know when the scope actually runs out of adjustment. I had a cheap tasco scope one time that would turn several full turns past the last actual adjustment and caused me problems because I expected it would get to 1000, but in actuality it would only get to 550. [ 01-15-2003: Message edited by: Bruce Gordon ] [/QUOTE]
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