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Rifles, Reloading, Optics, Equipment
Reloading
Severely Dented Cases….Secondary Explosion Effect?
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<blockquote data-quote="307WYO" data-source="post: 852747" data-attributes="member: 58848"><p><span style="color: black"><span style="font-family: 'Verdana'">Any help, advice, or ideas would be greatly appreciated... So here's the details, I'm shooting a 7mm ultra mag. Two days ago, I shot a 0.5" group with 88 gr RL-25 in once fired brass, federal 215M primer, and 140 gr nolser accubond. Once back at home, I loaded another 5 rounds with the identical load but the only differences were that I used new Remington brass and had to open a new sleeve of primers. The following morning, I headed back to the range. It resulted in big dents being left right in front of the case shoulder. There was burned powder on the outside of the case like gas entered between the chamber and the case. </span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">What I have read on this subject and the secondary explosion effect leans towards the idea that: 1.) the load is too light, 2.) the powder is burning to slow causing the case not to expand completely to the chamber wall. I then shot even a lighter load (87 gr) in a once fired case and everything was fine. Also re-tested it with the same load from the day before...... </span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">Long story short, the big dented cases were replicated 3 times, all with new brass and primers from a different sleeve. Anytime once fired brass was used, everything worked great. I am going to try a load with the new brass and some retumbo powder to see if the slightly faster burn rate will help….</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">I have shot this particular load (88gr RL-25) in multiple ultra mags prior to this one and they all shot amazing. </span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Could it be a bad batch of brass?</span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">Or the new brass possibly stiffer, and therefore not expanding enough? </span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">The primers are slightly defected causing the powder not to burn fast enough?</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Any help would be great. Thanks everyone </span></span></p></blockquote><p></p>
[QUOTE="307WYO, post: 852747, member: 58848"] [COLOR=black][FONT=Verdana]Any help, advice, or ideas would be greatly appreciated... So here's the details, I'm shooting a 7mm ultra mag. Two days ago, I shot a 0.5" group with 88 gr RL-25 in once fired brass, federal 215M primer, and 140 gr nolser accubond. Once back at home, I loaded another 5 rounds with the identical load but the only differences were that I used new Remington brass and had to open a new sleeve of primers. The following morning, I headed back to the range. It resulted in big dents being left right in front of the case shoulder. There was burned powder on the outside of the case like gas entered between the chamber and the case. [/FONT][/COLOR] [COLOR=black][FONT=Verdana]What I have read on this subject and the secondary explosion effect leans towards the idea that: 1.) the load is too light, 2.) the powder is burning to slow causing the case not to expand completely to the chamber wall. I then shot even a lighter load (87 gr) in a once fired case and everything was fine. Also re-tested it with the same load from the day before...... [/FONT][/COLOR] [COLOR=black][FONT=Verdana]Long story short, the big dented cases were replicated 3 times, all with new brass and primers from a different sleeve. Anytime once fired brass was used, everything worked great. I am going to try a load with the new brass and some retumbo powder to see if the slightly faster burn rate will help….[/FONT][/COLOR] [COLOR=black][FONT=Verdana] [/FONT][/COLOR] [COLOR=black][FONT=Verdana]I have shot this particular load (88gr RL-25) in multiple ultra mags prior to this one and they all shot amazing. [/FONT][/COLOR] [COLOR=black][FONT=Verdana] [/FONT][/COLOR] [COLOR=black][FONT=Verdana]Could it be a bad batch of brass?[/FONT][/COLOR] [COLOR=black][FONT=Verdana]Or the new brass possibly stiffer, and therefore not expanding enough? [/FONT][/COLOR] [COLOR=black][FONT=Verdana]The primers are slightly defected causing the powder not to burn fast enough?[/FONT][/COLOR] [COLOR=black][FONT=Verdana] [/FONT][/COLOR] [COLOR=black][FONT=Verdana]Any help would be great. Thanks everyone [/FONT][/COLOR] [/QUOTE]
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Severely Dented Cases….Secondary Explosion Effect?
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