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Optimizing Precision And Accuracy From VLD Bullets By Eric Stecker
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<blockquote data-quote="su37" data-source="post: 276859" data-attributes="member: 5541"><p>This is Eric's reply and my understanding of how Berger's work.</p><p></p><p>"Upon impact the VLD will penetrate 2" to 3" of hide and bone. After the bullet is through this tough surface of the animal it starts to shed its weight. Depending on impact velocity 40% to 80% of the bullets weight will be distributed inside the animal as fragmentation."</p><p></p><p>So we see 2" to 3" and the bullet starts coming apart. And then according to impact velocity</p><p>that determines how much bullet fragmentation we see which is 40% to 80%</p><p></p><p></p><p>Buffalobob says</p><p></p><p>"The more sectional density, then the more momentum remaining and therefore the more penetration."</p><p></p><p>So, if we have a 6.5/140/.287 SD bullet with the same SD as a 30/190/.286 SD bullet.</p><p>Both will penetrate the same then according to Buffalobob. Since both have the same SD.</p><p></p><p>If so,</p><p>Weight is not a factor then is it, or is it?</p><p></p><p>At 1000 yards there is less than 20 fps difference between the 190 and 210 VLD'S.</p><p>Then according to Eric, since they have the same impact speed their fragmentation</p><p>will be the same ratio BUT spreed out deeper with the 210 due to a higher SD. according to Bob.</p><p>It also obviously has more fragments to spew in it's path. 12 more grains at 40% for each bullet.</p><p>Is that a lot? I don't know. </p><p></p><p>Also, how much deep penetration is needed to kill an elk. </p><p>Both will penetrate and start expanding after 2"</p><p></p><p>I have to wonder how far in inches that 190 VLD will penetrate while fragmenting.</p><p></p><p></p><p>"That bullet was launched at 3250 fps which is very near dusting velocity for the Bergers and yet it did not grenade even though the jacket was at very near what many believe to be stress failure."</p><p></p><p>It should have to be consistent with Berger's statements.</p><p></p><p>All said,</p><p>I don't put much stock in SD which changes with bullet impact and KE which is just paper energy.</p><p></p><p>Just my musings.</p><p></p><p>And btw, I'll be using Bergers for hunting.</p></blockquote><p></p>
[QUOTE="su37, post: 276859, member: 5541"] This is Eric's reply and my understanding of how Berger's work. "Upon impact the VLD will penetrate 2" to 3" of hide and bone. After the bullet is through this tough surface of the animal it starts to shed its weight. Depending on impact velocity 40% to 80% of the bullets weight will be distributed inside the animal as fragmentation." So we see 2" to 3" and the bullet starts coming apart. And then according to impact velocity that determines how much bullet fragmentation we see which is 40% to 80% Buffalobob says "The more sectional density, then the more momentum remaining and therefore the more penetration." So, if we have a 6.5/140/.287 SD bullet with the same SD as a 30/190/.286 SD bullet. Both will penetrate the same then according to Buffalobob. Since both have the same SD. If so, Weight is not a factor then is it, or is it? At 1000 yards there is less than 20 fps difference between the 190 and 210 VLD'S. Then according to Eric, since they have the same impact speed their fragmentation will be the same ratio BUT spreed out deeper with the 210 due to a higher SD. according to Bob. It also obviously has more fragments to spew in it's path. 12 more grains at 40% for each bullet. Is that a lot? I don't know. Also, how much deep penetration is needed to kill an elk. Both will penetrate and start expanding after 2" I have to wonder how far in inches that 190 VLD will penetrate while fragmenting. "That bullet was launched at 3250 fps which is very near dusting velocity for the Bergers and yet it did not grenade even though the jacket was at very near what many believe to be stress failure." It should have to be consistent with Berger's statements. All said, I don't put much stock in SD which changes with bullet impact and KE which is just paper energy. Just my musings. And btw, I'll be using Bergers for hunting. [/QUOTE]
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