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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Different powders and barrel erosion
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<blockquote data-quote="DANTEC" data-source="post: 28672" data-attributes="member: 685"><p>general rule is ( following Vaught ) </p><p></p><p>3 factors </p><p>mecanical erosion ( sand blasting )</p><p>thermal effect </p><p>plasma effect </p><p></p><p></p><p>coarse tubular powder as 5010 ( not in production now I think ) that a good powder ( SD ) but grain of powder seem to make sand blasting in the throat </p><p></p><p>"hot" spherical powder , some ball powder ( very hight rate in nitro ) are very hot when they burn as example some old lot of SP7 ball powder ( french made powder ) <img src="http://images/icons/mad.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p>are so hot that you can see throat erosion after 400 rounds in 308 WIN slow fire ( not really a wild wildcat the 308 win )</p><p>now SP7 is more quiet by adding graphite but that a durty powder ( too much graphite )</p><p></p><p>some other facts seem right : </p><p>machine gun firing rate increase steel skin temperature up to resistance specs and you get very fast wear / erosion .</p><p></p><p>long neck with right ( sharp )shoulder angle are better for throat life , powder burn in neck not in throat , that seem logic </p><p></p><p>I am interesting to get other information on powder / barrel life too </p><p></p><p>good shooting</p><p></p><p>DAN TEC</p></blockquote><p></p>
[QUOTE="DANTEC, post: 28672, member: 685"] general rule is ( following Vaught ) 3 factors mecanical erosion ( sand blasting ) thermal effect plasma effect coarse tubular powder as 5010 ( not in production now I think ) that a good powder ( SD ) but grain of powder seem to make sand blasting in the throat "hot" spherical powder , some ball powder ( very hight rate in nitro ) are very hot when they burn as example some old lot of SP7 ball powder ( french made powder ) [img]images/icons/mad.gif[/img] are so hot that you can see throat erosion after 400 rounds in 308 WIN slow fire ( not really a wild wildcat the 308 win ) now SP7 is more quiet by adding graphite but that a durty powder ( too much graphite ) some other facts seem right : machine gun firing rate increase steel skin temperature up to resistance specs and you get very fast wear / erosion . long neck with right ( sharp )shoulder angle are better for throat life , powder burn in neck not in throat , that seem logic I am interesting to get other information on powder / barrel life too good shooting DAN TEC [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Different powders and barrel erosion
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