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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Perfect Bullet Weight/Velocity Combination
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<blockquote data-quote="Michael Eichele" data-source="post: 30083" data-attributes="member: 1007"><p>HI dbhostler,</p><p></p><p>There are some bullets that are actually made for particular cartridges. For instance, the 155 Palma and the 175 SMK were both made specifically for the 308 win. It depends on twist as to what velocity is optimum. </p><p></p><p>The 178 AMAX is similar to the 175 yet it was designed for a magnum.</p><p></p><p>Belive it or not, my rifle (308) will match a calculator better with the 175 vs the 178 even though my rifle like the 178 better for accuracy from 100-1000 yards.</p><p></p><p>My theory is a bullet that performs with as close to .500 BC out of your particular rifle/velocity combo as possible, will give you the best all around performance as far as matching a ballistic calculator to 1k. Otherwise if its higher or lower, it will be 1 BC to 600 yards and another from 600-1000 yards.</p><p></p><p>Typically a 308 likes 150-175's</p><p></p><p>A 30-06 likes 165-190's</p><p></p><p>A 300 mag like 180-210's</p><p></p><p>A 7mm likes 120-150's</p><p></p><p>A 338 likes 225-300's</p><p></p><p>This does not meen that other bullets wont work well in these calibers, rather these are the most optimum for "most" applications. Velocity and twist make up a huge part in whats optimum.</p><p></p><p>The Sierra reloading manual has a whealth of info on which bullets were made for what as well as reloading info within each rifles capabilities.</p><p></p><p>To answer your question directly, the best way to determine what you want to know is to go to JBM ballistics web page and go to calculations, then go to bullet drag and twist. You must know your own twist and various bullet demensions. Enter the info and play with different bullet demensions until you get a stability factor of 1.5 within the velocity paramiters of your rifles capabilities. It will tell you the best twist for the bullet info entered and a stability factor for your entered twist.</p><p> <a href="http://www.eskimo.com/~jbm/ballistics/ballistics.html" target="_blank">www.eskimo.com/~jbm/ballistics/ballistics.html</a></p><p></p><p>[ 12-24-2003: Message edited by: meichele ]</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 30083, member: 1007"] HI dbhostler, There are some bullets that are actually made for particular cartridges. For instance, the 155 Palma and the 175 SMK were both made specifically for the 308 win. It depends on twist as to what velocity is optimum. The 178 AMAX is similar to the 175 yet it was designed for a magnum. Belive it or not, my rifle (308) will match a calculator better with the 175 vs the 178 even though my rifle like the 178 better for accuracy from 100-1000 yards. My theory is a bullet that performs with as close to .500 BC out of your particular rifle/velocity combo as possible, will give you the best all around performance as far as matching a ballistic calculator to 1k. Otherwise if its higher or lower, it will be 1 BC to 600 yards and another from 600-1000 yards. Typically a 308 likes 150-175's A 30-06 likes 165-190's A 300 mag like 180-210's A 7mm likes 120-150's A 338 likes 225-300's This does not meen that other bullets wont work well in these calibers, rather these are the most optimum for "most" applications. Velocity and twist make up a huge part in whats optimum. The Sierra reloading manual has a whealth of info on which bullets were made for what as well as reloading info within each rifles capabilities. To answer your question directly, the best way to determine what you want to know is to go to JBM ballistics web page and go to calculations, then go to bullet drag and twist. You must know your own twist and various bullet demensions. Enter the info and play with different bullet demensions until you get a stability factor of 1.5 within the velocity paramiters of your rifles capabilities. It will tell you the best twist for the bullet info entered and a stability factor for your entered twist. [url="http://www.eskimo.com/~jbm/ballistics/ballistics.html"]www.eskimo.com/~jbm/ballistics/ballistics.html[/url] [ 12-24-2003: Message edited by: meichele ] [/QUOTE]
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