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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
How to blowup your rifle
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<blockquote data-quote="McDoone" data-source="post: 1386063" data-attributes="member: 21981"><p>In post 242 I proposed that this event was caused by a bad primer, either a manufacturer defect, or induced damage by the user. After reviewing all the details of his loading procedures it seems unlikely that he would have physically damaged the primer to the point that it would have failed to function normally, but there is no info about whether he handled primers with bare hands which can have the same outcome. </p><p>Where I was going with this is I believe that a primer popper/squib in a large case could cause partial ignition followed by complete detonation, the Secondary Explosion Effect mentioned by a more recent poster. (sorry, should have recognized at least your post number but failed to write it down, this is a long thread). S.S.E's have been very difficult to document but seems like powder manufacturers believe them to be credible, as they all post warnings against reduced loads of slow burning powders, and that to my knowledge was specifically the type of load that caused this to happen. </p><p>S.S.E's are reported to be catastrophic usually wrecking the gun and sometimes the user. </p><p>The mechanics of it are similar to a high compression engine. Used to be you could not go above 8.5 to 1 compression unless you used premium fuel for fear of engine wrecking detonation. Now they go well beyond that with regular gas by gradually feeding the fuel in under high pressure during ignition as the flame propagates. </p><p></p><p>I have no experience with the round in question but I have used Retumbo a fair amount and I like it. I wonder how much airspace is in the case above the powder column and if it could possibly be too much. Specifically I'm wondering if maximum loads are being reached with this bullet weight before achieving 98 percent or better case fill to prevent S.S.E. I'm picking 98 as that is my comfort zone. Basically I want a full case with a slow powder. Not sure what the actual number is but it has to be at least 95 percent. And the pressure has to be appropriate at this level of fill.</p></blockquote><p></p>
[QUOTE="McDoone, post: 1386063, member: 21981"] In post 242 I proposed that this event was caused by a bad primer, either a manufacturer defect, or induced damage by the user. After reviewing all the details of his loading procedures it seems unlikely that he would have physically damaged the primer to the point that it would have failed to function normally, but there is no info about whether he handled primers with bare hands which can have the same outcome. Where I was going with this is I believe that a primer popper/squib in a large case could cause partial ignition followed by complete detonation, the Secondary Explosion Effect mentioned by a more recent poster. (sorry, should have recognized at least your post number but failed to write it down, this is a long thread). S.S.E’s have been very difficult to document but seems like powder manufacturers believe them to be credible, as they all post warnings against reduced loads of slow burning powders, and that to my knowledge was specifically the type of load that caused this to happen. S.S.E’s are reported to be catastrophic usually wrecking the gun and sometimes the user. The mechanics of it are similar to a high compression engine. Used to be you could not go above 8.5 to 1 compression unless you used premium fuel for fear of engine wrecking detonation. Now they go well beyond that with regular gas by gradually feeding the fuel in under high pressure during ignition as the flame propagates. I have no experience with the round in question but I have used Retumbo a fair amount and I like it. I wonder how much airspace is in the case above the powder column and if it could possibly be too much. Specifically I’m wondering if maximum loads are being reached with this bullet weight before achieving 98 percent or better case fill to prevent S.S.E. I’m picking 98 as that is my comfort zone. Basically I want a full case with a slow powder. Not sure what the actual number is but it has to be at least 95 percent. And the pressure has to be appropriate at this level of fill. [/QUOTE]
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