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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
spin drift
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<blockquote data-quote="Michael Eichele" data-source="post: 250102" data-attributes="member: 1007"><p>I came up with 1.396 SF for the 7mm and 1.680 for the 300.</p><p></p><p>Giving you 5.83" of SD from the 7mm at 0', 29.92 and 59 degrees using the factory published BC.</p><p></p><p>The 300 calculated out to 6.52" of SD in the same conditions with the factory BC.</p><p></p><p>If I remember right, you were seeing about 8" of SD? 8-6=2</p><p></p><p>2" of difference could be scope missalignent, shooter error or mathematical descrepancies or all of the above. Also you were likley shooting much colder air than 59 degrees. Regardless, I have found this system to be scary close in any practical scenario up to 1K. I have seen it very close at 2K as well. However, close at that range could be 8" instead of 2" Still closer than not factoring it in at that range.</p><p></p><p>Also using Eaglets SF of 1.84 you are just over 7" at 1K. This makes the margin of error even closer assuming his program is better than mine.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 250102, member: 1007"] I came up with 1.396 SF for the 7mm and 1.680 for the 300. Giving you 5.83" of SD from the 7mm at 0', 29.92 and 59 degrees using the factory published BC. The 300 calculated out to 6.52" of SD in the same conditions with the factory BC. If I remember right, you were seeing about 8" of SD? 8-6=2 2" of difference could be scope missalignent, shooter error or mathematical descrepancies or all of the above. Also you were likley shooting much colder air than 59 degrees. Regardless, I have found this system to be scary close in any practical scenario up to 1K. I have seen it very close at 2K as well. However, close at that range could be 8" instead of 2" Still closer than not factoring it in at that range. Also using Eaglets SF of 1.84 you are just over 7" at 1K. This makes the margin of error even closer assuming his program is better than mine. [/QUOTE]
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