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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Short necks=short throat life??
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<blockquote data-quote="Fiftydriver" data-source="post: 58008" data-attributes="member: 10"><p>Goodgrouper,</p><p></p><p>It is my opinion from what I have seen that other factors other then throat length influence throat life to a greater degree.</p><p></p><p>From what I have seen doing research with rounds such as the 257 STW and 257 AM, it is throat diameter much more then any other throat dimension that effects the accuracy life of a throat. The tighter the throat the better, to a point. If you are using one bullet only then I like to cut throat diameters to 0.0002" over bullet diameter.</p><p></p><p>If my customers want to use several different bullets, I cut the throat 0.0005" over the largest bullet diameter they wish to use.</p><p></p><p>In all honesty, the larger the case capacity, the higher percentage of powder that will pass through the throat prior to ignition.</p><p></p><p>Also, stick powders are much more abrasive to the throat and origins of the rifling then a Ball powder. The stick powders also tend to burn a little hotter as well.</p><p></p><p>A nice sharp shoulder of at least 30 degrees will help contain the powder charge longer so mor eof it burns in the case but still some will burn in the throat section of the bore and even past that.</p><p></p><p>I have found that as far as accuracy goes, the proper rifling design increases accuracy life even more. For example a three groove system will take longer for the origins of the rifling to erode then a 6 groove system simply because there is more steel in each of the rifling on a 3 groove design, which takes longer to erode.</p><p></p><p>Most of the rounds I deal with a very large case capacity rounds for their bore and I will say that I am much more concerned with throat diameter and the style of rifling used then the length of the throat.</p><p></p><p>Just my opinion from what I have seen. Again, I do nto deal with traditional BR rounds much so take this for what you will. All my rounds are throat burners if you will but all will also offer +1000 of accurate barrel life which for a big game rifle is plenty.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 58008, member: 10"] Goodgrouper, It is my opinion from what I have seen that other factors other then throat length influence throat life to a greater degree. From what I have seen doing research with rounds such as the 257 STW and 257 AM, it is throat diameter much more then any other throat dimension that effects the accuracy life of a throat. The tighter the throat the better, to a point. If you are using one bullet only then I like to cut throat diameters to 0.0002" over bullet diameter. If my customers want to use several different bullets, I cut the throat 0.0005" over the largest bullet diameter they wish to use. In all honesty, the larger the case capacity, the higher percentage of powder that will pass through the throat prior to ignition. Also, stick powders are much more abrasive to the throat and origins of the rifling then a Ball powder. The stick powders also tend to burn a little hotter as well. A nice sharp shoulder of at least 30 degrees will help contain the powder charge longer so mor eof it burns in the case but still some will burn in the throat section of the bore and even past that. I have found that as far as accuracy goes, the proper rifling design increases accuracy life even more. For example a three groove system will take longer for the origins of the rifling to erode then a 6 groove system simply because there is more steel in each of the rifling on a 3 groove design, which takes longer to erode. Most of the rounds I deal with a very large case capacity rounds for their bore and I will say that I am much more concerned with throat diameter and the style of rifling used then the length of the throat. Just my opinion from what I have seen. Again, I do nto deal with traditional BR rounds much so take this for what you will. All my rounds are throat burners if you will but all will also offer +1000 of accurate barrel life which for a big game rifle is plenty. Good Shooting!! Kirby Allen(50) [/QUOTE]
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Short necks=short throat life??
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