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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet stability
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<blockquote data-quote="Mikecr" data-source="post: 1952804" data-attributes="member: 1521"><p><span style="font-size: 18px">I'll try with my understanding of </span>a<span style="font-size: 18px"> plastic tipped bullet being more stable than a FMJ <u>given same weight bullet</u>. The reason is increased <strong>rotational momentum</strong></span></p><p><span style="font-size: 18px"></span></p><p><span style="font-size: 18px">To keep a bullet weighing the same while a plastic tip is displacing lead, that lead previously in the nose (at smaller diameter than cal) is moved backward to extend bearing (which is at cal diameter). That's a bit more near cal diameter (bearing) lead spinning, with less under cal diameter(nose) lead spinning. </span></p><p><span style="font-size: 18px"><em>In other words, that amount of weight is moved further out from the spinning axis.</em></span></p><p><span style="font-size: 18px">So while Cg is moved backwards with Cp pretty much the same(de-stabilizing), the extra angular momentum of the longer bearing per weight bullet more than overcomes this.</span></p><p><span style="font-size: 18px"></span></p><p><span style="font-size: 18px">Hope I got this right</span></p></blockquote><p></p>
[QUOTE="Mikecr, post: 1952804, member: 1521"] [SIZE=5]I'll try with my understanding of [/SIZE]a[SIZE=5] plastic tipped bullet being more stable than a FMJ [U]given same weight bullet[/U]. The reason is increased [B]rotational momentum[/B] To keep a bullet weighing the same while a plastic tip is displacing lead, that lead previously in the nose (at smaller diameter than cal) is moved backward to extend bearing (which is at cal diameter). That’s a bit more near cal diameter (bearing) lead spinning, with less under cal diameter(nose) lead spinning. [I]In other words, that amount of weight is moved further out from the spinning axis.[/I] So while Cg is moved backwards with Cp pretty much the same(de-stabilizing), the extra angular momentum of the longer bearing per weight bullet more than overcomes this. Hope I got this right[/SIZE] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Bullet stability
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