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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Gel Test Data part 2
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<blockquote data-quote="Lou270" data-source="post: 2672715" data-attributes="member: 5352"><p>Not really tumble on bergers, but come apart. I would not count on any straight penetration after that happens, but lot of damage where it does. As soon as bullet enters the much more dense medium it will start to yaw. As a bullet yaws more surface area is presented and more drag/resistance is experienced. With sufficient velocity (pressure) and thin jacket the tip will collapse or bend and rupture the jacket and all heck breaks loose. The part where the bullet penetrates before coming apart or tumbling is called the narrow channel or neck. This can be longer depending on stability but typically a few inches at typical ranges. If there is not enough velocity or jacket too thick to rupture at that point the bullet will continue to yaw until it swaps ends. This can still be a pretty good wound as the increase in surface area doesnt matter if from an expanded bullet or sideways one. In the case of tumbling, the tip can break off or if there is a cannelure the bullet can break in half at that point with core becoming additional projectiles. </p><p></p><p>So in a sense lower stabiltity at impact is good for that type of bullet. There is not a wide enough hollow point, lead tip, etc… to initiate expansion. Barbour creek has a good video of berger at 30 yards and 500 yards. You can see it has big damage after couple inches at 30 yards and what looks like 6" or so at longer range. Of course target resistance (ie soft vs bone) will also determine how fast something comes apart so these are generalities</p><p></p><p>Lou</p></blockquote><p></p>
[QUOTE="Lou270, post: 2672715, member: 5352"] Not really tumble on bergers, but come apart. I would not count on any straight penetration after that happens, but lot of damage where it does. As soon as bullet enters the much more dense medium it will start to yaw. As a bullet yaws more surface area is presented and more drag/resistance is experienced. With sufficient velocity (pressure) and thin jacket the tip will collapse or bend and rupture the jacket and all heck breaks loose. The part where the bullet penetrates before coming apart or tumbling is called the narrow channel or neck. This can be longer depending on stability but typically a few inches at typical ranges. If there is not enough velocity or jacket too thick to rupture at that point the bullet will continue to yaw until it swaps ends. This can still be a pretty good wound as the increase in surface area doesnt matter if from an expanded bullet or sideways one. In the case of tumbling, the tip can break off or if there is a cannelure the bullet can break in half at that point with core becoming additional projectiles. So in a sense lower stabiltity at impact is good for that type of bullet. There is not a wide enough hollow point, lead tip, etc… to initiate expansion. Barbour creek has a good video of berger at 30 yards and 500 yards. You can see it has big damage after couple inches at 30 yards and what looks like 6” or so at longer range. Of course target resistance (ie soft vs bone) will also determine how fast something comes apart so these are generalities Lou [/QUOTE]
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Gel Test Data part 2
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