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200 gr berger hybrids
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<blockquote data-quote="RockyMtnMT" data-source="post: 1307244" data-attributes="member: 7999"><p>Yes. Also how long the projectile stays point forward as it penetrates. The higher the stability of the bullet the longer it stays in the proper orientation in penetration. RPM of the bullet degrades very little in flight but as soon as it contacts the target the rpm's drop quickly. The higher they are the longer the bullet stays in the intended orientation. Our first lightbulb moment with this was when we were developing our 80g .243cal bullet. We were doing low vel impact testing with reduced loads. Our test rifle was a 243 win with a 10" twist. The bullet would not open up at 1800fps and we could not get the vel higher with trail boss powder as we were out of case capacity. We had on hand a 6-284 Lapua imp that we were building for a customer. We figured with the larger case capacity we could get the vel up and find the min that that bullet would work. We loaded the rifle and shot it into the test media and had the same 1800fps vel from the 243. Disappointed we dug the bullet out expecting the same result and found a perfectly deformed bullet. Difference was a 7" twist. Only difference in the test was the stability of the bullet. It was very marginal with the .243 and above the 1.5sg that is considered fully stable with the 6-284. Lots of light bulbs went on that day. Since then we have paid close attn. to the stability of our low vel impact testing. The higher the stability the farther the bullets will penetrate before they upset and start to flip. Almost all bullets just before they stop in the media will start to tumble. Only makes sense as the rpms slow down. When they are very well stabilized they will often stop still in perfect orientation.</p><p></p><p>I used to hunt with marginally stable bullets because they shot very accurately to very long range. I had some animals that I had taken that showed less than perfect terminal performance but just did not give it a lot of thought other than I thought the bullet was not working as well I thought it should.</p><p></p><p>With our testing I have come to the conclusion that 1.5sg is not fully stable for terminal performance but really a minimum for terminal performance. If a guy can get above 1.5sg and closer to 2sg terminal performance increases. So like all other things it is a give and a take. You can get much better bullet performance form the liter bullet but give up some bc to reach out there. I have changed my personal equipment to get the best terminal performance possible and adjust my effective hunting range accordingly.</p><p></p><p>As a bullet manufacture I fear a customer having less than good terminal performance than I do not having enough bc to reach as far. Impact at distance can be calculated, what happens when the bullet strikes is no longer in our control. I just know that the chances of it not doing what I expect go down greatly the higher the stability gets.</p><p></p><p>Steve</p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 1307244, member: 7999"] Yes. Also how long the projectile stays point forward as it penetrates. The higher the stability of the bullet the longer it stays in the proper orientation in penetration. RPM of the bullet degrades very little in flight but as soon as it contacts the target the rpm's drop quickly. The higher they are the longer the bullet stays in the intended orientation. Our first lightbulb moment with this was when we were developing our 80g .243cal bullet. We were doing low vel impact testing with reduced loads. Our test rifle was a 243 win with a 10" twist. The bullet would not open up at 1800fps and we could not get the vel higher with trail boss powder as we were out of case capacity. We had on hand a 6-284 Lapua imp that we were building for a customer. We figured with the larger case capacity we could get the vel up and find the min that that bullet would work. We loaded the rifle and shot it into the test media and had the same 1800fps vel from the 243. Disappointed we dug the bullet out expecting the same result and found a perfectly deformed bullet. Difference was a 7" twist. Only difference in the test was the stability of the bullet. It was very marginal with the .243 and above the 1.5sg that is considered fully stable with the 6-284. Lots of light bulbs went on that day. Since then we have paid close attn. to the stability of our low vel impact testing. The higher the stability the farther the bullets will penetrate before they upset and start to flip. Almost all bullets just before they stop in the media will start to tumble. Only makes sense as the rpms slow down. When they are very well stabilized they will often stop still in perfect orientation. I used to hunt with marginally stable bullets because they shot very accurately to very long range. I had some animals that I had taken that showed less than perfect terminal performance but just did not give it a lot of thought other than I thought the bullet was not working as well I thought it should. With our testing I have come to the conclusion that 1.5sg is not fully stable for terminal performance but really a minimum for terminal performance. If a guy can get above 1.5sg and closer to 2sg terminal performance increases. So like all other things it is a give and a take. You can get much better bullet performance form the liter bullet but give up some bc to reach out there. I have changed my personal equipment to get the best terminal performance possible and adjust my effective hunting range accordingly. As a bullet manufacture I fear a customer having less than good terminal performance than I do not having enough bc to reach as far. Impact at distance can be calculated, what happens when the bullet strikes is no longer in our control. I just know that the chances of it not doing what I expect go down greatly the higher the stability gets. Steve [/QUOTE]
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