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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Short necks=short throat life??
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<blockquote data-quote="brianwinzor" data-source="post: 58025" data-attributes="member: 1067"><p>Goodgrouper, I am using a 22/250 AI with the 28 degree shoulder in a 1 in 10 twist Shilen SS barrel. This barrel was previously used for the .224 Clark for 1600 shots, before being set back and rechambered.</p><p></p><p>I am using the Sierra 69 grain HPBT moly, and have fired about 300 shots, which included about 130 rounds of load development with 9 different powders. </p><p></p><p>About 3 weeks ago, I measured the distance to the lands with this bullet, and found that the distance was still 2.470 inches, so there had been no throat erosion. I didn't believe it, so I remeasured two more times and got the same result.</p><p></p><p>All my rifles are potential throat burners, but I have learnt over the last 30 years to manage that problem. </p><p></p><p>I would guess that getting the barrel too hot, combined with a high pressure load, are the most likely reasons for only getting 1050 shots of barrel life. Did you measure the amount of throat erosion at that point? </p><p></p><p>I have found that most of my "barrel burners" develop between .150 and .250 inches of throat erosion by about 1500 shots. At this point there is usually about 70 - 100 fps less velocity, (200 fps in 1 rifle) and although accuracy has deteriorated, they still seem to capable of shooting around .800 moa, as long as they are cleaned regularly.</p><p></p><p>I also try to use a ball powder where possible in my "barrel burners", as Ken Clark (who developed the .224 Clark) found in his research that it helped to extend barrel life, and have followed his advice. </p><p></p><p>I am currently using 46.0 grains of Winchester WMR with the Sierra 69 grain bullet for about 3430 fps in my field loads. Hope this is of some assistance. Regards, Brian.</p></blockquote><p></p>
[QUOTE="brianwinzor, post: 58025, member: 1067"] Goodgrouper, I am using a 22/250 AI with the 28 degree shoulder in a 1 in 10 twist Shilen SS barrel. This barrel was previously used for the .224 Clark for 1600 shots, before being set back and rechambered. I am using the Sierra 69 grain HPBT moly, and have fired about 300 shots, which included about 130 rounds of load development with 9 different powders. About 3 weeks ago, I measured the distance to the lands with this bullet, and found that the distance was still 2.470 inches, so there had been no throat erosion. I didn't believe it, so I remeasured two more times and got the same result. All my rifles are potential throat burners, but I have learnt over the last 30 years to manage that problem. I would guess that getting the barrel too hot, combined with a high pressure load, are the most likely reasons for only getting 1050 shots of barrel life. Did you measure the amount of throat erosion at that point? I have found that most of my "barrel burners" develop between .150 and .250 inches of throat erosion by about 1500 shots. At this point there is usually about 70 - 100 fps less velocity, (200 fps in 1 rifle) and although accuracy has deteriorated, they still seem to capable of shooting around .800 moa, as long as they are cleaned regularly. I also try to use a ball powder where possible in my "barrel burners", as Ken Clark (who developed the .224 Clark) found in his research that it helped to extend barrel life, and have followed his advice. I am currently using 46.0 grains of Winchester WMR with the Sierra 69 grain bullet for about 3430 fps in my field loads. Hope this is of some assistance. Regards, Brian. [/QUOTE]
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Short necks=short throat life??
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