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Rifles, Reloading, Optics, Equipment
Reloading
Do you consider Sectional Density when choosing a bullet?
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<blockquote data-quote="bengineer" data-source="post: 2259408" data-attributes="member: 36951"><p>SD changes when a bullet changes shape.</p><p> In theory, we usually want hunting bullets to travel happily, without deviating from our preferred flight plan or moving lots of air, and then change shape to displace lots of tissue. Thats a tall order, one a simple ratio cannot address unless we limit our input variables to two: change length and weight with similar construction. Well, thats boring, and prevents SD from being useful when comparing bullets of different construction.</p><p>So, take a look at bullet construction. Look at materials used and the thickness of the jacket, depth of hollow point, look at expanded bullets and see what they turn into. Then compare to what you want a bullet to do. For example, most avoid a RN form for long range. But if you could hit with a soft RN at distance, you may find that form to readily expand. But, it may expand wide and not penetrate deeply, maybe even causing harm but not killing. But a soft, sleek pointy bullet would fly flatter and hit faster, maybe causing the bullet to expand in such a way as to end up with a narrow "mushroom," allowing deep penetration along with rapid expansion. Those are two quite different results and SD may calculate to be identical on both.</p><p>SD and non-expanders was mentioned previously in post #6; that post is spot on.</p></blockquote><p></p>
[QUOTE="bengineer, post: 2259408, member: 36951"] SD changes when a bullet changes shape. In theory, we usually want hunting bullets to travel happily, without deviating from our preferred flight plan or moving lots of air, and then change shape to displace lots of tissue. Thats a tall order, one a simple ratio cannot address unless we limit our input variables to two: change length and weight with similar construction. Well, thats boring, and prevents SD from being useful when comparing bullets of different construction. So, take a look at bullet construction. Look at materials used and the thickness of the jacket, depth of hollow point, look at expanded bullets and see what they turn into. Then compare to what you want a bullet to do. For example, most avoid a RN form for long range. But if you could hit with a soft RN at distance, you may find that form to readily expand. But, it may expand wide and not penetrate deeply, maybe even causing harm but not killing. But a soft, sleek pointy bullet would fly flatter and hit faster, maybe causing the bullet to expand in such a way as to end up with a narrow “mushroom,” allowing deep penetration along with rapid expansion. Those are two quite different results and SD may calculate to be identical on both. SD and non-expanders was mentioned previously in post #6; that post is spot on. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Do you consider Sectional Density when choosing a bullet?
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