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Rifles, Reloading, Optics, Equipment
Reloading
Elevation differences
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<blockquote data-quote="Mikecr" data-source="post: 2159254" data-attributes="member: 1521"><p>Twist requirements are declared at a standard atmosphere of 59degF and sea level, and some reasonable MV (like 2800fps).</p><p>3,000' already raises your stability from sea level more than you'll lose from 5,000'.</p><p>108BT, 8tw, StdICAO = Sg~1.45</p><p>108BT, 8tw, 3000' pressure altitude = Sg~1.59</p><p>108BT, 8tw, 5000' pressure altitude = Sg~1.69</p><p></p><p>So going from 5k to 3k causes loss of stability by 0.1</p><p>But, going from 0 to 3k raised stability 0.14 over Berger's recommended.</p><p></p><p>Good to go</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2159254, member: 1521"] Twist requirements are declared at a standard atmosphere of 59degF and sea level, and some reasonable MV (like 2800fps). 3,000' already raises your stability from sea level more than you'll lose from 5,000'. 108BT, 8tw, StdICAO = Sg~1.45 108BT, 8tw, 3000' pressure altitude = Sg~1.59 108BT, 8tw, 5000' pressure altitude = Sg~1.69 So going from 5k to 3k causes loss of stability by 0.1 But, going from 0 to 3k raised stability 0.14 over Berger's recommended. Good to go [/QUOTE]
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