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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What Is This???
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<blockquote data-quote="Deleted member 46119" data-source="post: 1249932"><p>I have seen this. In other peoples rifles.</p><p></p><p>First, lets see if I an answer the original question: what caused this?</p><p></p><p>If my understanding is correct, the "cause" is the neck of the case not sealing to the chamber. The "blow by" of the powder residue on to the shoulder supports this.</p><p></p><p>Next, what caused the neck to not seal against the chamber?</p><p></p><p>If my understanding is correct, there are multiple contributors. "Old" stiff brass? Over diameter chamber in the neck area? Degraded powder in the "old" factory rounds? Maybe more things? </p><p></p><p>From your pictures, it appears that the body of the case did seal against the chamber, saving you from receiving a face full of hot gases.</p><p></p><p>How do you prevent this from happening in the future?</p><p></p><p>That box of factory ammo is suspect. If it were me: pull the bullets, weight the charges. etc... Basically don't use that box as loaded. </p><p></p><p>Anneal necks. The neck has to seal to the chamber before the gasses get past the shoulder. Minimal resizing or neck sizing only also helps with sealing.</p></blockquote><p></p>
[QUOTE="Deleted member 46119, post: 1249932"] I have seen this. In other peoples rifles. First, lets see if I an answer the original question: what caused this? If my understanding is correct, the "cause" is the neck of the case not sealing to the chamber. The "blow by" of the powder residue on to the shoulder supports this. Next, what caused the neck to not seal against the chamber? If my understanding is correct, there are multiple contributors. "Old" stiff brass? Over diameter chamber in the neck area? Degraded powder in the "old" factory rounds? Maybe more things? From your pictures, it appears that the body of the case did seal against the chamber, saving you from receiving a face full of hot gases. How do you prevent this from happening in the future? That box of factory ammo is suspect. If it were me: pull the bullets, weight the charges. etc... Basically don't use that box as loaded. Anneal necks. The neck has to seal to the chamber before the gasses get past the shoulder. Minimal resizing or neck sizing only also helps with sealing. [/QUOTE]
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