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Berger VLD performance on bone question...
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<blockquote data-quote="RockyMtnMT" data-source="post: 1357146" data-attributes="member: 7999"><p>I know that our bullets are a different type of bullet but I think a lot of what I have learned from our testing translates to all bullets. There are two things that are essential to bullet terminal performance. The hollow point and the stability factor. The bigger the hollow point the more reliable it will be terminally. The higher the stability factor the better the terminal performance. The size of the hollow point is pretty easy to comprehend. We have determined that we are not able to produce a reliable bullet for hunting with a hollow point smaller than 1.5mm. We thought we had a good 1mm hp that worked well in media tests but when used on elk we were not happy with them and have now scrapped the idea.</p><p></p><p>Stability factor is not as easy to wrap your head around. Our testing has shown that a marginal stability factor less than 1.5sg will greatly increase the probability of bullet failure. The problem is, you can have stellar accuracy with marginal stability. This is where the bullet manufactures fall short. To my knowledge we are the only ones that talk about it. There are many bullets that are marketed to factory rifle shooters that are marginally stable in the factory twist. Particularly with the push for heavier higher bc bullets. The heavier for caliber a bullet gets the more twist it needs to be fully stable.</p><p></p><p>So if you think about it, all bullets are a hollow point of some kind and need hydraulics to enter the hp to make it expand outwardly. The small the hole the harder it is to get hydraulics into it. Add a little bit of yaw to the bullet and it makes the hp even smaller. Think of the bullet as a top spinning. Spinning fast it stays point true to flight. For terminal performance we need that point to stay true to flight after it makes contact. The moment that the bullet makes contact the rpm of the bullet drops due to the contact allowing the tip or yaw potentially before it has gathered enough hydraulics into the hp to cause outward expansion. The more marginal the stability of a bullet the sooner on impact it tips. The higher the stability the longer a bullet stays point oriented as it passes through the media.</p><p></p><p>From our testing, bullets used for hunting should be a minimum of 1.5sg and higher is better. With that said the more vld shaped a bullet gets the more important the stability gets.</p><p></p><p>Good shooting to all.</p><p></p><p>Steve</p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 1357146, member: 7999"] I know that our bullets are a different type of bullet but I think a lot of what I have learned from our testing translates to all bullets. There are two things that are essential to bullet terminal performance. The hollow point and the stability factor. The bigger the hollow point the more reliable it will be terminally. The higher the stability factor the better the terminal performance. The size of the hollow point is pretty easy to comprehend. We have determined that we are not able to produce a reliable bullet for hunting with a hollow point smaller than 1.5mm. We thought we had a good 1mm hp that worked well in media tests but when used on elk we were not happy with them and have now scrapped the idea. Stability factor is not as easy to wrap your head around. Our testing has shown that a marginal stability factor less than 1.5sg will greatly increase the probability of bullet failure. The problem is, you can have stellar accuracy with marginal stability. This is where the bullet manufactures fall short. To my knowledge we are the only ones that talk about it. There are many bullets that are marketed to factory rifle shooters that are marginally stable in the factory twist. Particularly with the push for heavier higher bc bullets. The heavier for caliber a bullet gets the more twist it needs to be fully stable. So if you think about it, all bullets are a hollow point of some kind and need hydraulics to enter the hp to make it expand outwardly. The small the hole the harder it is to get hydraulics into it. Add a little bit of yaw to the bullet and it makes the hp even smaller. Think of the bullet as a top spinning. Spinning fast it stays point true to flight. For terminal performance we need that point to stay true to flight after it makes contact. The moment that the bullet makes contact the rpm of the bullet drops due to the contact allowing the tip or yaw potentially before it has gathered enough hydraulics into the hp to cause outward expansion. The more marginal the stability of a bullet the sooner on impact it tips. The higher the stability the longer a bullet stays point oriented as it passes through the media. From our testing, bullets used for hunting should be a minimum of 1.5sg and higher is better. With that said the more vld shaped a bullet gets the more important the stability gets. Good shooting to all. Steve [/QUOTE]
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