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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
How to true the BC
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<blockquote data-quote="Hondo64d" data-source="post: 2543649" data-attributes="member: 1390"><p>First things first. Is the scope tracking correctly? Do a tall target test to verify that. If the scope is not tracking correctly, it will skew your results. Make sure your inputs to your ballistic calculator are correct. Scope height, zero offset, atmospherics, etc, really matter.</p><p></p><p>Im not familiar with Zeiss' ballistic calculator, so I would bounce its computations against JBM, Ballistic AE or another proven ballistics engine to verify its giving you correct data.</p><p></p><p>Once you've proven none of the above is an issue, if Bryan Litz has provided a BC for the bullet I am using, I trust it and concentrate on truing velocity. Ballistic AE has a velocity truing function which makes it very easy. I seldom use a chronograph anymore. I get a precise 100yard zero, put in an educated guess on velocity in Ballistic AE, and go right to 900 yards, because that's as far as my range goes. I true the velocity at 900 and have never not had the trajectory match when I'm done.</p><p></p><p>John</p></blockquote><p></p>
[QUOTE="Hondo64d, post: 2543649, member: 1390"] First things first. Is the scope tracking correctly? Do a tall target test to verify that. If the scope is not tracking correctly, it will skew your results. Make sure your inputs to your ballistic calculator are correct. Scope height, zero offset, atmospherics, etc, really matter. Im not familiar with Zeiss’ ballistic calculator, so I would bounce its computations against JBM, Ballistic AE or another proven ballistics engine to verify its giving you correct data. Once you’ve proven none of the above is an issue, if Bryan Litz has provided a BC for the bullet I am using, I trust it and concentrate on truing velocity. Ballistic AE has a velocity truing function which makes it very easy. I seldom use a chronograph anymore. I get a precise 100yard zero, put in an educated guess on velocity in Ballistic AE, and go right to 900 yards, because that’s as far as my range goes. I true the velocity at 900 and have never not had the trajectory match when I’m done. John [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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How to true the BC
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