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The Basics, Starting Out
Wind Drift formula
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<blockquote data-quote="User4302021" data-source="post: 1688410" data-attributes="member: 105322"><p>You don't really understand the method at all.</p><p></p><p>It is called the BC method because the first number of the G1 BC closely <em><strong>approximates</strong></em> the wind that will give you 0.1 MIL drift per 100 yards. A better nomenclature would be the <em><strong>MIL</strong></em> method (the wind that gives 1 MIL drift at 1K yards).</p><p></p><p>When properly calculated, this method will keep you to within 0.1 MILs at all yard lines to 1K, (or within a rounds supersonic range). I use it for 223, all the way up to 338AX.</p><p></p><p>The G1 number lines up with a projectile traveling 2,800 fps at 2,000 ft elevation.</p><p></p><p>If your bullet is 200 fps faster, your 5 mph bullet (.500 G1) will be a "6".</p><p></p><p>If your bullet is 200 fps slower, your 5mph bullet will be a "4".</p><p></p><p>4,000ft of positive elevation change, and your 5mph bullet becomes a "6".</p><p></p><p>At sea-level, it changes from "5" to "4.5".</p><p></p><p>When the Army wrote this method into the newest sniper manual, even they failed to understand the effects of velocity and altitude. That is why they are wrong in the manual.</p><p></p><p>If you are fingering an app to tell you your drift, you are already behind the curve. What are you gonna do when your phone dies, or freezes, or shuts down from over heating? It just isn't that hard.</p></blockquote><p></p>
[QUOTE="User4302021, post: 1688410, member: 105322"] You don't really understand the method at all. It is called the BC method because the first number of the G1 BC closely [I][B]approximates[/B][/I] the wind that will give you 0.1 MIL drift per 100 yards. A better nomenclature would be the [I][B]MIL[/B][/I] method (the wind that gives 1 MIL drift at 1K yards). When properly calculated, this method will keep you to within 0.1 MILs at all yard lines to 1K, (or within a rounds supersonic range). I use it for 223, all the way up to 338AX. The G1 number lines up with a projectile traveling 2,800 fps at 2,000 ft elevation. If your bullet is 200 fps faster, your 5 mph bullet (.500 G1) will be a "6". If your bullet is 200 fps slower, your 5mph bullet will be a "4". 4,000ft of positive elevation change, and your 5mph bullet becomes a "6". At sea-level, it changes from "5" to "4.5". When the Army wrote this method into the newest sniper manual, even they failed to understand the effects of velocity and altitude. That is why they are wrong in the manual. If you are fingering an app to tell you your drift, you are already behind the curve. What are you gonna do when your phone dies, or freezes, or shuts down from over heating? It just isn't that hard. [/QUOTE]
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Wind Drift formula
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