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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
BC help
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<blockquote data-quote="Topshot" data-source="post: 461258" data-attributes="member: 13285"><p>Tikkamike,</p><p>Hard to work out a B.C. from close range observations of bullet drop. Better to do it at the longest distance available to you.</p><p>This is what I would do.</p><p> </p><p>First calibrate your scope elevation turret. This will confirm that what you dial is what you get. Or what error is inbuilt into your scope turret.</p><p> </p><p>Then shoot at least five shot groups at three distances.</p><p>(1) 100 yards, </p><p>(2) Your maximum distance and </p><p>(3) mid range.</p><p> </p><p>Use your measured velocity and your calibrated amount of dial up at each distance to calculate a usable B.C. based on (real) MOA dialed. </p><p> </p><p>You need real MOA to calculate a good B.C. but as you may be dealing with a turret with error, you will need to calculate a correction factor. i.e. if you dial up 30 MOA on your scope and you actually get 32 MOA then your correction factor for "Shooter" is 0.9375 </p><p> </p><p>Then if your turrets are not quite accurate, use the correction factor on the "shooter" program to give you your corrected turret adjustments needed for any distance out to your measured and tested maximum.</p><p> </p><p>This sounds complicated but is easy to do with the "shooter" app. I have been doing just this same thing over the last few weeks with Hornady 225 grain pills out of my .338RUM and it works very well with this app on my HTC Android phone.</p><p> </p><p>Let me know if you need any further help.</p></blockquote><p></p>
[QUOTE="Topshot, post: 461258, member: 13285"] Tikkamike, Hard to work out a B.C. from close range observations of bullet drop. Better to do it at the longest distance available to you. This is what I would do. First calibrate your scope elevation turret. This will confirm that what you dial is what you get. Or what error is inbuilt into your scope turret. Then shoot at least five shot groups at three distances. (1) 100 yards, (2) Your maximum distance and (3) mid range. Use your measured velocity and your calibrated amount of dial up at each distance to calculate a usable B.C. based on (real) MOA dialed. You need real MOA to calculate a good B.C. but as you may be dealing with a turret with error, you will need to calculate a correction factor. i.e. if you dial up 30 MOA on your scope and you actually get 32 MOA then your correction factor for "Shooter" is 0.9375 Then if your turrets are not quite accurate, use the correction factor on the "shooter" program to give you your corrected turret adjustments needed for any distance out to your measured and tested maximum. This sounds complicated but is easy to do with the "shooter" app. I have been doing just this same thing over the last few weeks with Hornady 225 grain pills out of my .338RUM and it works very well with this app on my HTC Android phone. Let me know if you need any further help. [/QUOTE]
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