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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
195 grain 7mm Berger - How Much Cartridge Will it Need?
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<blockquote data-quote="joeycoates" data-source="post: 889499" data-attributes="member: 72330"><p>I must be looking at something incorrectly on the calculator then?</p><p></p><p>Twist Rate Stability Calculator</p><p></p><p></p><p>Use this form to determine your gyroscopic stability factor (SG) based on the Miller Twist Rule</p><p></p><p>Input Parameters</p><p>Caliber .284 </p><p>Bullet Weight 195 Grains</p><p>Bullet Length 1.5 </p><p>Barrel Twist 9 Inches/Turn</p><p>Muzzle Velocity 3000</p><p>Temperature 59 </p><p>Altitude 4500 Feet</p><p></p><p></p><p></p><p>SG = 2.01</p><p></p><p>Not saying that you will not need a 8.5 or 8 twist to stabilize, I am just asking. </p><p></p><p>Is there any reason not to run that fast of a twist rate, i.e. would it make lighter bullets come apart easier at higher MV's due to the increased RPM's leaving the barrel?</p></blockquote><p></p>
[QUOTE="joeycoates, post: 889499, member: 72330"] I must be looking at something incorrectly on the calculator then? Twist Rate Stability Calculator Use this form to determine your gyroscopic stability factor (SG) based on the Miller Twist Rule Input Parameters Caliber .284 Bullet Weight 195 Grains Bullet Length 1.5 Barrel Twist 9 Inches/Turn Muzzle Velocity 3000 Temperature 59 Altitude 4500 Feet SG = 2.01 Not saying that you will not need a 8.5 or 8 twist to stabilize, I am just asking. Is there any reason not to run that fast of a twist rate, i.e. would it make lighter bullets come apart easier at higher MV's due to the increased RPM's leaving the barrel? [/QUOTE]
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195 grain 7mm Berger - How Much Cartridge Will it Need?
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