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throat erosion?
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<blockquote data-quote="dwm" data-source="post: 9147" data-attributes="member: 1136"><p>I agree, I think throat errosion is caused by heat and pressure. So what causes extreme heat and pressure in the throat area? </p><p></p><p>I propose that it is heavy bullets with very long bearing surfaces, barrels with very fast twists, and relatively fast buring powder. </p><p></p><p>Heavy bullets take more force to overcome forward inertia. </p><p></p><p>Bullets with long bearing surfaces take much more force to cut the rifling in the jacket and experience more friction going down the barrel.</p><p></p><p>Tight twists take much more force to over come the rotational moment of inertia. (spin up)</p><p></p><p>These effects combine to cause the bullet to be held in the throat longer and the heat and pressure caused by (relatively fast) buring powder melt the throat. </p><p></p><p>So those heavy, really long, high ballistic coeffient bullets and the fast twists required to stablize them are the cause of rapid throat errosion.</p><p></p><p>It really bites that this combination is required for great performance at long range.</p><p></p><p>I think the only saving grace it that this situation can be compensated for somewhat with really slow burning powder and very long barrels.</p><p></p><p>Gain twist barrels may help somewhat by allowing the bullet to get out of the throat before it has to spin up.</p><p></p><p>Doug</p><p></p><p>[ 01-25-2004: Message edited by: dwm ]</p></blockquote><p></p>
[QUOTE="dwm, post: 9147, member: 1136"] I agree, I think throat errosion is caused by heat and pressure. So what causes extreme heat and pressure in the throat area? I propose that it is heavy bullets with very long bearing surfaces, barrels with very fast twists, and relatively fast buring powder. Heavy bullets take more force to overcome forward inertia. Bullets with long bearing surfaces take much more force to cut the rifling in the jacket and experience more friction going down the barrel. Tight twists take much more force to over come the rotational moment of inertia. (spin up) These effects combine to cause the bullet to be held in the throat longer and the heat and pressure caused by (relatively fast) buring powder melt the throat. So those heavy, really long, high ballistic coeffient bullets and the fast twists required to stablize them are the cause of rapid throat errosion. It really bites that this combination is required for great performance at long range. I think the only saving grace it that this situation can be compensated for somewhat with really slow burning powder and very long barrels. Gain twist barrels may help somewhat by allowing the bullet to get out of the throat before it has to spin up. Doug [ 01-25-2004: Message edited by: dwm ] [/QUOTE]
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