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Rifles, Reloading, Optics, Equipment
Reloading
How fast, and what weight, must a bullet run to stabilize in a 6 mm , 14 twist barrel?
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<blockquote data-quote="Hugnot" data-source="post: 2191929" data-attributes="member: 115658"><p>Using the Miller stability estimator:</p><p></p><p>[ATTACH=full]272687[/ATTACH]</p><p>There are many bullets that would stabilize in a slow twist .243 like the 58 & 65 grain V-Max ® provided certain velocities are reached. Many of these short & light weight bullets have plastic tips. The <em>Berger stability estimator does not make provisions for bullets having plastic tips.</em> I would suggest going to the JBM stability calculator should you desire to use short & light weight 6mm bullets having plastic tips.</p><p></p><p> Another bullet not having a plastic tip is the 60 6mm Sierra hollow point varminter; I have used these against rodents for years before the advent of plastic tip bullets. Sierra makes a 55 grain plastic tip bullet, the 55 grain Blitz King ®. Running the Miller stability estimator again for the stubby light weight Sierra bullets:</p><p></p><p>[ATTACH=full]272690[/ATTACH]</p><p></p><p>The suggested Sg value needed to ensure stability is 1.4. I have found the Miller stability estimator to be conservative. The JBM estimator makes provisions for plastic tip bullets; plastic tip bullets appear to be your best solution for your 14 twist barrel.</p><p></p><p>The involved math is simple addition, subtraction, multiplication, division, except for some exponential stuff. A comparison for 30 caliber bullets is used - "=(30*H8)". The math appears on the top line. The JBM stability calculator should provide identical stability estimator values. JBM also has a list of bullet lengths. JBM has some plastic tip lengths but .14 inches is real close.</p><p></p><p>A comparison of the 70 grain Sierra Blitz King ® with the 55 Sierra Blitz King ®:</p><p></p><p>[ATTACH=full]272700[/ATTACH]</p><p></p><p>Looks like the 70 grain Sierra Blitz King ® is your best choice. The .008 shorter length of the 70 grain Sierra Blitz King ® compared to the longer & more pointy 65 grain V-Max ® allows for slower velocities to get Sg's over 1.39</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2191929, member: 115658"] Using the Miller stability estimator: [ATTACH type="full" alt="Screenshot (178).png"]272687[/ATTACH] There are many bullets that would stabilize in a slow twist .243 like the 58 & 65 grain V-Max ® provided certain velocities are reached. Many of these short & light weight bullets have plastic tips. The [I]Berger stability estimator does not make provisions for bullets having plastic tips.[/I] I would suggest going to the JBM stability calculator should you desire to use short & light weight 6mm bullets having plastic tips. Another bullet not having a plastic tip is the 60 6mm Sierra hollow point varminter; I have used these against rodents for years before the advent of plastic tip bullets. Sierra makes a 55 grain plastic tip bullet, the 55 grain Blitz King ®. Running the Miller stability estimator again for the stubby light weight Sierra bullets: [ATTACH type="full"]272690[/ATTACH] The suggested Sg value needed to ensure stability is 1.4. I have found the Miller stability estimator to be conservative. The JBM estimator makes provisions for plastic tip bullets; plastic tip bullets appear to be your best solution for your 14 twist barrel. The involved math is simple addition, subtraction, multiplication, division, except for some exponential stuff. A comparison for 30 caliber bullets is used - "=(30*H8)". The math appears on the top line. The JBM stability calculator should provide identical stability estimator values. JBM also has a list of bullet lengths. JBM has some plastic tip lengths but .14 inches is real close. A comparison of the 70 grain Sierra Blitz King ® with the 55 Sierra Blitz King ®: [ATTACH type="full"]272700[/ATTACH] Looks like the 70 grain Sierra Blitz King ® is your best choice. The .008 shorter length of the 70 grain Sierra Blitz King ® compared to the longer & more pointy 65 grain V-Max ® allows for slower velocities to get Sg's over 1.39 [/QUOTE]
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How fast, and what weight, must a bullet run to stabilize in a 6 mm , 14 twist barrel?
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