November 23, 2022. Ever wonder what causes a bulge or marking on a bag? What makes the case unfit for further use? Incipient Case-Head Separation
This Winchester.308 Win case has a real problem. This case has an incipient case head split that is rapidly becoming a major problem. It is most commonly caused due to over-sizing the case, which causes excessive headspace. This case is almost ready to fall apart after a few firings and subsequent adjustments. This case requires proper die adjustment. This case cannot be reused.
You will see two pressure signs in the photo of the case rim. First, take a look at the primer. It is flattened to the maximum safety level. This would be the only sign of pressure. I would still be able to lift this load, but I would keep an eye on it, especially if it was going to be used in warmer temperatures. This load could easily reach the “excessive pressure” realm quickly. There is one other sign of pressure we must not ignore. You’ll notice an obvious ejector mark that is located above the R-P headtamp. This clearly indicates that the load was not within the safe pressure range. These rounds should not be fired if they were loaded. They should be taken apart. Split the case-neck
This is an R-P.22-250 case, which has died. The case is in good condition, except for the split neck. This case should be thrown away. A split neck is something you need to be aware of. It is caused due to brass work-hardening. Brass cases become harder with age and usage. If a case is stored for too long, it can become so hard that it will split in two. I’ve seen factory loads do the exact same thing. These cases get more difficult as we resize them and fire them repeatedly. They will eventually split. Careful annealing can extend the life of a case. This issue would be a topic that needs to be addressed in an entire article. This case is not usable. I use examples like these to help students understand what to look for in reloading. As always, if we can assist you, whether you are new to reloading or very experienced, contact us here at Sierra Bullets by phone at 1-800-223-8799 or by email at [email protected] Case Body
Here is a Lake City 7.62×51 (.308 win.) This case has two large marks/dents on the case body. This case could have been caught in action by a semi-auto rifle. The firearm jammed or the case failed during the cycling process. To avoid feeding problems, I wouldn’t reload the case. This case was also factory loaded round. I don’t see any pressure issues, or damage to it. It has a very rounded shoulder and is split. It was obvious from the first glance that this round had been subject to excessive pressure. The firearm (perhaps an AR?) was damaged. The firearm (perhaps an AR) was not in full charge. The primer was extremely flat and the outer radius of the primer cup was lost when I examined it closer. High pressure! I noticed a dripping mark on the case rim. This is most likely an incident of excessive pressure. This case is damaged and should be thrown away. It becomes second nature to notice the small things after a while. As you get more familiar with the reloading process, don’t be complacent. Sierra’s Techs can be reached at 1-800-223-8799 if you have any questions.
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