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Long Range Hunting & Shooting
Penatration & Expansion test.
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<blockquote data-quote="elkaholic" data-source="post: 509823" data-attributes="member: 13833"><p>Tank.....welcome to the club!<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> I've done quite a bit of this while testing my bullets against other manufactures. There are a lot of different medias that you can use only limited by your imagination! Some obviously work better than others. Make sure you build something substantially long because you may shoot through more than you think! With many bullets, reduced loads are apt to shoot through more than high velocity loads because of the lack of expansion. Water is a VERY good media but you need alot of it to stop the bullet. I often use a few layers of old carpet at the end of my testing media because they act somewhat like a flak jacket for catching already expanded bullets. If you build a box, make sure it is at least 6 feet long or you may not capture some of your bullets (depending on media). Another VERY common problem is finding the bullets in the media. This is more of a problem than you might imagine so think that through in your design. When I use wet paper, or cardboard, I usually slide in a "check paper" (no holes) to see where the bullet is headed. You will get a feel for this after you shoot a few as to penetration depth. A powder like IMR 4198 is good for reduced loads to duplicate long range impact velocities. Bear in mind that a bullet fired from a given twist at a muzzle velocity of say 1800' will not act exactly the same as the same bullet fired from the same barrel at 3000' and impacting at 1800'. This is because the rotational velocity of the bullet is far greater at impact which tends to aid in expanding the bullet. I don't know EXACTLY how much difference it makes, but just keep that in mind. i.e. a bullet tested in this way will likely expand a little more in the real world hunting velocity than a reduced load given the same media. Believe it or not, water will cause greater expansion than dry paper etc. Sometimes I use a layer of carpet at the beginning to simulate hide and you can use bone or ?? if you like. If you have the option, use a PORKER like Roy did! Have a ball.........Rich</p></blockquote><p></p>
[QUOTE="elkaholic, post: 509823, member: 13833"] Tank.....welcome to the club!:D I've done quite a bit of this while testing my bullets against other manufactures. There are a lot of different medias that you can use only limited by your imagination! Some obviously work better than others. Make sure you build something substantially long because you may shoot through more than you think! With many bullets, reduced loads are apt to shoot through more than high velocity loads because of the lack of expansion. Water is a VERY good media but you need alot of it to stop the bullet. I often use a few layers of old carpet at the end of my testing media because they act somewhat like a flak jacket for catching already expanded bullets. If you build a box, make sure it is at least 6 feet long or you may not capture some of your bullets (depending on media). Another VERY common problem is finding the bullets in the media. This is more of a problem than you might imagine so think that through in your design. When I use wet paper, or cardboard, I usually slide in a "check paper" (no holes) to see where the bullet is headed. You will get a feel for this after you shoot a few as to penetration depth. A powder like IMR 4198 is good for reduced loads to duplicate long range impact velocities. Bear in mind that a bullet fired from a given twist at a muzzle velocity of say 1800' will not act exactly the same as the same bullet fired from the same barrel at 3000' and impacting at 1800'. This is because the rotational velocity of the bullet is far greater at impact which tends to aid in expanding the bullet. I don't know EXACTLY how much difference it makes, but just keep that in mind. i.e. a bullet tested in this way will likely expand a little more in the real world hunting velocity than a reduced load given the same media. Believe it or not, water will cause greater expansion than dry paper etc. Sometimes I use a layer of carpet at the beginning to simulate hide and you can use bone or ?? if you like. If you have the option, use a PORKER like Roy did! Have a ball.........Rich [/QUOTE]
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