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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
sectional density & stopping power ?
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<blockquote data-quote="Beng" data-source="post: 599023" data-attributes="member: 37512"><p>Hi winmag.</p><p>To kill / stop an animal you got to hinder its central nervous system from working.</p><p>This can be achieved by hitting the CNS directly, or cutting its oxygen supply.</p><p>The latter can be achieved by either hitting the heart or by blood loss.</p><p>Brain and heart are tiny targets at long ranges, thus i would recommend killing by blood loss.</p><p></p><p>The more blood the animal looses, the earlier it will sucumb to its wounds.</p><p>The more tissue damage you inflict in an highly circulated body part, the greater the bloodloss over time will be. Especially when the heart isn't damaged.</p><p></p><p>Necessary condition for high blood loss is penetration into an area with high blood circulation, this will be the torso with lungs, liver and a high density of arteries and veines.</p><p>Hitting both lungs and exiting has the nice side effect of hindering the animals respiration and thus stopping the cns' oxygen supply.</p><p></p><p>Sectional density affects penetration, the heavier a bullet (design and caliber given) is, the deeper it will penetrate.</p><p>This effect can be achieved also by using bullets of a more rugged design, though this will usualy compromise tissue damage.</p><p>The bigger the bullets diameter, the more tissue damage you will inflict.</p><p>More Energy to work with, more fragments &c</p><p></p><p>Conclusion:</p><p>Choosing a potent catridge, which is able to accelerate a heavy for caliber bullet at least to standard speeds (~2700 fps muzzle velocity I guess) will allow you to choose bullets of less rugged design which will penetrate deeply and do more damage by fragmenting, than sturdier bullets would do.</p><p>The faster your bullet travels at impact the higher the stresses inflicted on the bullet will be and the sturdier its design has to be to ensure deep penetration instead of surface fragmentation.</p><p></p><p>With more rugged design I mean for example: </p><p>Hornady DGS > Barnes TSX > unbonded softpoint > varmint bullet.</p><p></p><p>For optimum stopping power choose a catridge that delivers your bullet at </p><p>2000 - 2200 fps terminal velocity for your choosen maximum range.</p><p>Then choose a proven hunting bullet with sufficient bc to achieve this velocity and sufficient accuracy in your gun.</p><p>Last but not least your catridge should be appropriate for the heaviest game you will hunt with this gun.</p><p>For Roe deer a 6,5x47 is quite appropriate, for hogs or wisent more potent catridges have to be choosen.</p><p></p><p>As you already own catridges appropriate for medium game, I would recommend something heavier.</p><p>A .338" or even a .375" caliber perhaps?</p><p>There is a german .375 catridge based on the .338 Lapua I'm quite interested in.</p><p>Afair Kirby Allen got something similar and as you live in Wildcatters paradies, other gunsmiths will propably offer similar catridges too.</p><p></p><p>ps: did some spelling corrections</p><p>pps: I didn't read most of the replies, when I started writing this just 2 replies were posted.</p><p>ppps: I like your terminal ballistic link senderofan.</p></blockquote><p></p>
[QUOTE="Beng, post: 599023, member: 37512"] Hi winmag. To kill / stop an animal you got to hinder its central nervous system from working. This can be achieved by hitting the CNS directly, or cutting its oxygen supply. The latter can be achieved by either hitting the heart or by blood loss. Brain and heart are tiny targets at long ranges, thus i would recommend killing by blood loss. The more blood the animal looses, the earlier it will sucumb to its wounds. The more tissue damage you inflict in an highly circulated body part, the greater the bloodloss over time will be. Especially when the heart isn't damaged. Necessary condition for high blood loss is penetration into an area with high blood circulation, this will be the torso with lungs, liver and a high density of arteries and veines. Hitting both lungs and exiting has the nice side effect of hindering the animals respiration and thus stopping the cns' oxygen supply. Sectional density affects penetration, the heavier a bullet (design and caliber given) is, the deeper it will penetrate. This effect can be achieved also by using bullets of a more rugged design, though this will usualy compromise tissue damage. The bigger the bullets diameter, the more tissue damage you will inflict. More Energy to work with, more fragments &c Conclusion: Choosing a potent catridge, which is able to accelerate a heavy for caliber bullet at least to standard speeds (~2700 fps muzzle velocity I guess) will allow you to choose bullets of less rugged design which will penetrate deeply and do more damage by fragmenting, than sturdier bullets would do. The faster your bullet travels at impact the higher the stresses inflicted on the bullet will be and the sturdier its design has to be to ensure deep penetration instead of surface fragmentation. With more rugged design I mean for example: Hornady DGS > Barnes TSX > unbonded softpoint > varmint bullet. For optimum stopping power choose a catridge that delivers your bullet at 2000 - 2200 fps terminal velocity for your choosen maximum range. Then choose a proven hunting bullet with sufficient bc to achieve this velocity and sufficient accuracy in your gun. Last but not least your catridge should be appropriate for the heaviest game you will hunt with this gun. For Roe deer a 6,5x47 is quite appropriate, for hogs or wisent more potent catridges have to be choosen. As you already own catridges appropriate for medium game, I would recommend something heavier. A .338" or even a .375" caliber perhaps? There is a german .375 catridge based on the .338 Lapua I'm quite interested in. Afair Kirby Allen got something similar and as you live in Wildcatters paradies, other gunsmiths will propably offer similar catridges too. ps: did some spelling corrections pps: I didn't read most of the replies, when I started writing this just 2 replies were posted. ppps: I like your terminal ballistic link senderofan. [/QUOTE]
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sectional density & stopping power ?
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