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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist vs Bullet Weight Question
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<blockquote data-quote="Mikecr" data-source="post: 2938522" data-attributes="member: 1521"><p>If you just trim back a bullet nose and replace copper with plastic, bullet stability would take a hit.</p><p>But to keep a plastic tipped bullet at the same weight & overall length, bullet makers would add to lead core -in the nose.</p><p>This moves CM forward, and the lead added is at a larger cross section near bearing diameter( more inertia).</p><p>With that, you can essentially subtract the plastic tip length from calculations, and **** if it doesn't work out right.</p><p></p><p>A tricky part when using actual stability math (instead of a rule of thumb), could be meplat diameter(MD).</p><p>What is the relative MD of a plastic tip, which squishes/melts a bit at high velocities?</p><p>MD is huge to drag, so it's huge to BC and stability.</p><p>Well you might notice that plastic tipped bullets have no better BC than non-tipped bullets. </p><p>That tells me that plastic MD is unchanged overall, -from normal. So I use non-tipped bullet version MD in calcs for both BC and stability.</p><p></p><p>I am aggravating to most forum people, I'm sure. </p><p>Sux, but somebody has to be me I guess..</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2938522, member: 1521"] If you just trim back a bullet nose and replace copper with plastic, bullet stability would take a hit. But to keep a plastic tipped bullet at the same weight & overall length, bullet makers would add to lead core -in the nose. This moves CM forward, and the lead added is at a larger cross section near bearing diameter( more inertia). With that, you can essentially subtract the plastic tip length from calculations, and **** if it doesn't work out right. A tricky part when using actual stability math (instead of a rule of thumb), could be meplat diameter(MD). What is the relative MD of a plastic tip, which squishes/melts a bit at high velocities? MD is huge to drag, so it's huge to BC and stability. Well you might notice that plastic tipped bullets have no better BC than non-tipped bullets. That tells me that plastic MD is unchanged overall, -from normal. So I use non-tipped bullet version MD in calcs for both BC and stability. I am aggravating to most forum people, I'm sure. Sux, but somebody has to be me I guess.. [/QUOTE]
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Twist vs Bullet Weight Question
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