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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
BALLISTIC COEFFICIENTS/Twist Rates
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<blockquote data-quote="groper" data-source="post: 417695" data-attributes="member: 12550"><p>i guess what it comes down to is how sure are you of your zero, velocity and scope tracking? even small errors here will produce big changes in BC.</p><p></p><p>For example, if your zero is 1 click off, then that translates to about 5 inches at 1000yds.</p><p></p><p>If your scope tracking is out by 5% per click as my last scope was, thats approx another 10inches. </p><p></p><p>and if your chrony or velocity guesstimate is out by 30fps, thats more again... so if you put all that into your ballistic calc and work back, you can get quite a large varience in BC...</p><p></p><p>do you use the same scope on each rifle? are your velocities measured on the same chrony on the same day each time you test?</p></blockquote><p></p>
[QUOTE="groper, post: 417695, member: 12550"] i guess what it comes down to is how sure are you of your zero, velocity and scope tracking? even small errors here will produce big changes in BC. For example, if your zero is 1 click off, then that translates to about 5 inches at 1000yds. If your scope tracking is out by 5% per click as my last scope was, thats approx another 10inches. and if your chrony or velocity guesstimate is out by 30fps, thats more again... so if you put all that into your ballistic calc and work back, you can get quite a large varience in BC... do you use the same scope on each rifle? are your velocities measured on the same chrony on the same day each time you test? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
BALLISTIC COEFFICIENTS/Twist Rates
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