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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Recovered Barnes bullet
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<blockquote data-quote="RockyMtnMT" data-source="post: 1262498" data-attributes="member: 7999"><p>Hey Jeff,</p><p></p><p>You and I have talked lots about this subject. We come from two different positions on how we want a bullet to work. But we both want the same conclusion. So in that aspect we are totally on the same page. What the bullet does on impact is the cause of the damage that we are looking for to result in the terminal performance that we need. I personally continue to learn every time we test bullets. My conclusions of the shape of the frontal area of the deformed bullet passing through soft tissue is the flatter and less round the deformation is the larger the resulting permanent wound channel is. The bigger the displacement is the bigger the permanent wound channel is. Hard to quantify exactly where one passes the other. My conclusion is the bigger the flat not rounded deformed bullet is the more permanent wounding is caused. There is a balance here though. There needs to be enough sectional density to drive the deformed bullet through the soft tissue to cause the damage. If a bullet opens up huge in comparison to caliber and keeps that size it will have a difficult time penetrating far enough to get the job done. The more the bullet slows down inside the animal the less it causes damage. When I got into designing bullets I went with the best physics study I could find on terminal effects of bullets. The shooting holes in wounding theories.</p><p></p><p>I also see the value of rapid expansion or deformation that is the principle effect that you like for terminal performance. This one is more difficult to control with higher vel impacts. We have used yours and others data for how rapid expansion works on game and incorporated it in our design. That is why we run our hp much deeper than most bullets looking for 70-80% weight retention. At real high vel impacts we see the bullets completely deforming within the 1st inch of impact. Can't do much about this other than the retained bullet is still plenty to carry through however far is needed to get to the vitals.</p><p></p><p>So figuring out where absolute dia out ways the shape of the deformation is tough. Not sure that it can every really be known. Not like low bc bullet running faster than high bc bullet. There is always a point down range that the high bc bullet catches up and surpasses the lower bc faster bullet.</p><p></p><p>Sorry for the confusion and my frustration. I just could not deal with the "shape of a projectile has no bearing on terminal performance".</p><p></p><p>Steve</p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 1262498, member: 7999"] Hey Jeff, You and I have talked lots about this subject. We come from two different positions on how we want a bullet to work. But we both want the same conclusion. So in that aspect we are totally on the same page. What the bullet does on impact is the cause of the damage that we are looking for to result in the terminal performance that we need. I personally continue to learn every time we test bullets. My conclusions of the shape of the frontal area of the deformed bullet passing through soft tissue is the flatter and less round the deformation is the larger the resulting permanent wound channel is. The bigger the displacement is the bigger the permanent wound channel is. Hard to quantify exactly where one passes the other. My conclusion is the bigger the flat not rounded deformed bullet is the more permanent wounding is caused. There is a balance here though. There needs to be enough sectional density to drive the deformed bullet through the soft tissue to cause the damage. If a bullet opens up huge in comparison to caliber and keeps that size it will have a difficult time penetrating far enough to get the job done. The more the bullet slows down inside the animal the less it causes damage. When I got into designing bullets I went with the best physics study I could find on terminal effects of bullets. The shooting holes in wounding theories. I also see the value of rapid expansion or deformation that is the principle effect that you like for terminal performance. This one is more difficult to control with higher vel impacts. We have used yours and others data for how rapid expansion works on game and incorporated it in our design. That is why we run our hp much deeper than most bullets looking for 70-80% weight retention. At real high vel impacts we see the bullets completely deforming within the 1st inch of impact. Can't do much about this other than the retained bullet is still plenty to carry through however far is needed to get to the vitals. So figuring out where absolute dia out ways the shape of the deformation is tough. Not sure that it can every really be known. Not like low bc bullet running faster than high bc bullet. There is always a point down range that the high bc bullet catches up and surpasses the lower bc faster bullet. Sorry for the confusion and my frustration. I just could not deal with the "shape of a projectile has no bearing on terminal performance". Steve [/QUOTE]
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Recovered Barnes bullet
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