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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Strange high speed from Obermeyer barrel
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<blockquote data-quote="James Jones" data-source="post: 107399" data-attributes="member: 8843"><p>I have seen where a realy tight chamber will not show typical pressure signs until its dangerously high. But even in a factory gun I don't think that these loads would be so high that it would cause major pressure problems , and like I stated even the listed book loads were way faster than listed in the book. I know that the case volume varies from one to another but I seriously doubt that the Lapua cases are that much thicker that it would cause perssure so high as to warrent velocities this high especialy at book listed powder charges.</p><p></p><p>Typicaly I would think that the best indicator of pressure would be the case expansion followed by shinney spots on the case head and primer cratering. I also know that when one experiances velocities higher than what the load books list that your typicaly over the SAMMI spec on pressure which is another quick way that alot of guys guage pressure by.</p><p>All of these reasons are why I'm concerned about these velocities. My final test is going to be case life , I'm gonna take one case and fire it by itself and measure the case streching and when the primmer pocket gets loose. I'll be running this test this afternoon. guaging fromother Lapua cased rounds I have loaded for (308,30-06,243) I'm ecpecting to get at least 8 shots before the primmers start to get loose and typicaly 3-4 shots before they need trimming when neck sized.</p></blockquote><p></p>
[QUOTE="James Jones, post: 107399, member: 8843"] I have seen where a realy tight chamber will not show typical pressure signs until its dangerously high. But even in a factory gun I don't think that these loads would be so high that it would cause major pressure problems , and like I stated even the listed book loads were way faster than listed in the book. I know that the case volume varies from one to another but I seriously doubt that the Lapua cases are that much thicker that it would cause perssure so high as to warrent velocities this high especialy at book listed powder charges. Typicaly I would think that the best indicator of pressure would be the case expansion followed by shinney spots on the case head and primer cratering. I also know that when one experiances velocities higher than what the load books list that your typicaly over the SAMMI spec on pressure which is another quick way that alot of guys guage pressure by. All of these reasons are why I'm concerned about these velocities. My final test is going to be case life , I'm gonna take one case and fire it by itself and measure the case streching and when the primmer pocket gets loose. I'll be running this test this afternoon. guaging fromother Lapua cased rounds I have loaded for (308,30-06,243) I'm ecpecting to get at least 8 shots before the primmers start to get loose and typicaly 3-4 shots before they need trimming when neck sized. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Strange high speed from Obermeyer barrel
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