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Bullet Construction vs Lethality
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<blockquote data-quote="nralifer" data-source="post: 2904433" data-attributes="member: 94556"><p>I don't take offense to your criticisms, but those pics are from an experiment of very low impact velocity designed to show what happens in the early stages of tip ejection. I forget now what the speeds of impact were, but they were far lower than we recommend for consistent expansion (1400 fps or so). Also we used the first generation of bullet which required a 1900 fps impact velocity for adequate expansion. In the BD2 series we changed the hollow point shape and lengthened the ogive some as well as made the ogive a bit thinner, with the result that we can see very adequate expansion down below 1700. See photos of .284 160 gr BD2. The first is the bullet impacting at a very low speed without the tip, a first generation bullet as it has 6 petals, just to illustrate the point about tips inhibiting hollow point expansion. The tips, though, are useful in improving BC and long range accuracy. A compromise, of course, has to be found between low impact velocity and long range accuracy. This is achieved by modifying the internal hollow point structure that eventually required custom tooling. Those refinements improved the lower speed impact behavior of the BD2 design which has 5 petals each with a larger base to improve retention.</p></blockquote><p></p>
[QUOTE="nralifer, post: 2904433, member: 94556"] I don’t take offense to your criticisms, but those pics are from an experiment of very low impact velocity designed to show what happens in the early stages of tip ejection. I forget now what the speeds of impact were, but they were far lower than we recommend for consistent expansion (1400 fps or so). Also we used the first generation of bullet which required a 1900 fps impact velocity for adequate expansion. In the BD2 series we changed the hollow point shape and lengthened the ogive some as well as made the ogive a bit thinner, with the result that we can see very adequate expansion down below 1700. See photos of .284 160 gr BD2. The first is the bullet impacting at a very low speed without the tip, a first generation bullet as it has 6 petals, just to illustrate the point about tips inhibiting hollow point expansion. The tips, though, are useful in improving BC and long range accuracy. A compromise, of course, has to be found between low impact velocity and long range accuracy. This is achieved by modifying the internal hollow point structure that eventually required custom tooling. Those refinements improved the lower speed impact behavior of the BD2 design which has 5 petals each with a larger base to improve retention. [/QUOTE]
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