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Rifles, Reloading, Optics, Equipment
Reloading
Chrony/Ballistics Software Discrepancies
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<blockquote data-quote="MNbogboy" data-source="post: 533213" data-attributes="member: 18849"><p>Maybe we have all doubted our software from time to time.....A while back I did some 300 yard shooting with one of my 260s...It is topped with a newer Elite 4200 6-24.....The Berger program told me to dial up +3.64" at 100 for the 2880 fps 130 VLD for the 300 yard zero....It shot a so-so (2+") group strung out mostly horizontal (breezy day)well over 2 inches above the mark.....This stumped me and there was nothing to adjust on the program to even get me close.....back to zero and 100 yards....five shot ragged-holes most of the time in the .3 to .5 range......A second session at the three hundred yard target again produced 2+ inch high group at just under an inch and three quarters.......Turns out after checking the distance to target with both range finders and a tape measure, all program settings, altitude, BC.....even shot over the chrono at 100 yards to see if it was way off (even though it is impossible to get that 260 going fast enough to produce the results I thought I was having)..........The Bushnell scope is advertised as 1/8 MOA clicks....<strong>that was my blunder</strong>.....My math says a one eigth MOA click has an inch value of about .130" at 100 yards....After extensive testing at 100 yards it turns out each click value is about .158"(average over testing).......Now instead of 28 clicks I tried 23....This time I blew what might have been a nice group with my second shot with a high right flyer but the next 4 hovered all within 3/4 inch of the center ring........Total group was 2 1/4".....</p><p></p><p>I know that the click value of most scopes is not exact but this one is over 20% higher than advertised.....I didn't expect that from a good mid range scope....Field testing should always be the final solution...and in my case at least the field testing not only verified the ballistic program was correct but also the chrony, and range finders....The only thing in question still is why the scope adjustments aren't even close to their advertised value...Am I missing something?.....Without knowing the internal geometry and thread pitch of the adjustment screw I can't prove it to myself...I am at the lower end of adjustment because of Burris rings and inserts....My theory is that the click value changes the farther you get out from true center but that is only a guess at this point unless somebody out there knows why......</p><p></p><p>In the mean time I look forward to plugging in the numbers and making up a few dope cards and heading down to the rifle club to try some 400, 500 and 600 yard.....I only have 100, 155 and 297 here at home....</p><p></p><p>Good Shooting,</p><p>Randy</p></blockquote><p></p>
[QUOTE="MNbogboy, post: 533213, member: 18849"] Maybe we have all doubted our software from time to time.....A while back I did some 300 yard shooting with one of my 260s...It is topped with a newer Elite 4200 6-24.....The Berger program told me to dial up +3.64" at 100 for the 2880 fps 130 VLD for the 300 yard zero....It shot a so-so (2+") group strung out mostly horizontal (breezy day)well over 2 inches above the mark.....This stumped me and there was nothing to adjust on the program to even get me close.....back to zero and 100 yards....five shot ragged-holes most of the time in the .3 to .5 range......A second session at the three hundred yard target again produced 2+ inch high group at just under an inch and three quarters.......Turns out after checking the distance to target with both range finders and a tape measure, all program settings, altitude, BC.....even shot over the chrono at 100 yards to see if it was way off (even though it is impossible to get that 260 going fast enough to produce the results I thought I was having)..........The Bushnell scope is advertised as 1/8 MOA clicks....[B]that was my blunder[/B].....My math says a one eigth MOA click has an inch value of about .130" at 100 yards....After extensive testing at 100 yards it turns out each click value is about .158"(average over testing).......Now instead of 28 clicks I tried 23....This time I blew what might have been a nice group with my second shot with a high right flyer but the next 4 hovered all within 3/4 inch of the center ring........Total group was 2 1/4"..... I know that the click value of most scopes is not exact but this one is over 20% higher than advertised.....I didn't expect that from a good mid range scope....Field testing should always be the final solution...and in my case at least the field testing not only verified the ballistic program was correct but also the chrony, and range finders....The only thing in question still is why the scope adjustments aren't even close to their advertised value...Am I missing something?.....Without knowing the internal geometry and thread pitch of the adjustment screw I can't prove it to myself...I am at the lower end of adjustment because of Burris rings and inserts....My theory is that the click value changes the farther you get out from true center but that is only a guess at this point unless somebody out there knows why...... In the mean time I look forward to plugging in the numbers and making up a few dope cards and heading down to the rifle club to try some 400, 500 and 600 yard.....I only have 100, 155 and 297 here at home.... Good Shooting, Randy [/QUOTE]
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