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The Basics, Starting Out
Wind Drift formula
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<blockquote data-quote="Greyfox" data-source="post: 1671500" data-attributes="member: 10291"><p>In my experience the 6.5CM(260, 6.5x47, etc) seems to fall between the traditional 308 formula of 15 and the typical high BC factor of 20 used for the ballistics produced for cartridges in the 6.5x284 class with velocities in the 2900-3000FPS range. Quite frankly, using an odd number of 16 or 17 somewhat defeats the purpose of a quick mental calculation, and I'd find it more efficient to use a dope sheet, or a MIL scope/formula which is very fast and quite accurate. IMO.</p></blockquote><p></p>
[QUOTE="Greyfox, post: 1671500, member: 10291"] In my experience the 6.5CM(260, 6.5x47, etc) seems to fall between the traditional 308 formula of 15 and the typical high BC factor of 20 used for the ballistics produced for cartridges in the 6.5x284 class with velocities in the 2900-3000FPS range. Quite frankly, using an odd number of 16 or 17 somewhat defeats the purpose of a quick mental calculation, and I’d find it more efficient to use a dope sheet, or a MIL scope/formula which is very fast and quite accurate. IMO. [/QUOTE]
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Wind Drift formula
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