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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New "to me" made in Montana monolithic bullets ...
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<blockquote data-quote="WildRose" data-source="post: 2418997" data-attributes="member: 30902"><p>They apply because they are very different projectiles that are launched in very different ways and greatly different speeds.</p><p></p><p>They had to come up with all kinds of new math formulas for aerodynamics the close we got to the sound barrier for the same reason and for the same reason it's taken nearly fifty years to really come up with aircraft that can sustain hypersonic flight and still be able to land on a runway that's not five miles long.</p><p></p><p>As for the arrows, there's no way to control for yaw or induce the necessary spin for stabilization without fletchings.</p><p></p><p>For the same reasons ballistics changed dramatically as we progressed from round ball to mini ball to round nosed bullets and finally to the spire point type bullets we've been using for most of the last hundred years. We found out that when we added a longer nose there was less resistance to the wind and they would hold velocity much, much longer so the ballistic formulas had to change to accommodate for the new shape. Same things we've seen as we progressed to ever longer profiles with traditional ogives thence into hybrid and VLD's with a completely different geometry.</p><p></p><p>Some things are just more aerodynamic at low speed while others much more efficient at super sonic speeds.</p><p></p><p>As for moving the center of balance forward on a bullet, that's going to cause it to pitch down at least to some degree compared to a more traditionally styled bullet all else being equal and that means it's not going to ride the wind as well. You've got to account for that difference somehow in the rest of the bullet to avoid that. Time and bullets on target compared to similar weight bullets of traditional flat base or tapered bases will tell. Like I said, it's just a theoretical concern but no data yet to support it.</p></blockquote><p></p>
[QUOTE="WildRose, post: 2418997, member: 30902"] They apply because they are very different projectiles that are launched in very different ways and greatly different speeds. They had to come up with all kinds of new math formulas for aerodynamics the close we got to the sound barrier for the same reason and for the same reason it's taken nearly fifty years to really come up with aircraft that can sustain hypersonic flight and still be able to land on a runway that's not five miles long. As for the arrows, there's no way to control for yaw or induce the necessary spin for stabilization without fletchings. For the same reasons ballistics changed dramatically as we progressed from round ball to mini ball to round nosed bullets and finally to the spire point type bullets we've been using for most of the last hundred years. We found out that when we added a longer nose there was less resistance to the wind and they would hold velocity much, much longer so the ballistic formulas had to change to accommodate for the new shape. Same things we've seen as we progressed to ever longer profiles with traditional ogives thence into hybrid and VLD's with a completely different geometry. Some things are just more aerodynamic at low speed while others much more efficient at super sonic speeds. As for moving the center of balance forward on a bullet, that's going to cause it to pitch down at least to some degree compared to a more traditionally styled bullet all else being equal and that means it's not going to ride the wind as well. You've got to account for that difference somehow in the rest of the bullet to avoid that. Time and bullets on target compared to similar weight bullets of traditional flat base or tapered bases will tell. Like I said, it's just a theoretical concern but no data yet to support it. [/QUOTE]
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New "to me" made in Montana monolithic bullets ...
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