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Hey guys, I'm seeing this come up on some resized 223 casings, and I'm not sure of the cause. Dies are RCBS (FL, not SB). I've cleaned and inspected and the sizing die and there are no corresponding ridges on the die itself. Brass is R-P, 1x fired. I also sometimes notice it on Winchester (rare) and PMC (very often, like maybe 10-15% of 1x fired cases).
The casings come out with a thin, somewhat bright line. It usually shows up just above the body-shoulder junction, but I've also noticed it right at the body-shoulder junction, or also much closer to the shoulder-neck junction.
With a fine dental pick (Montana Jack), you can feel that some of the brass is displaced, i.e. its a gouge or cut of some sort. It's not very deep, likely <0.0001" It's not just an irregularity in the surface of the brass. Checking from the inside, I'm unable to detect any thinning of the brass. Out of my last run of 275 cases, probably 10 came out like this. It's hard to notice (which is why it's loaded) and I only picked it up during my post-loading QA check. No problem pulling it apart and tossing the brass, but I'm wondering about the cause.
223.jpg
The casings come out with a thin, somewhat bright line. It usually shows up just above the body-shoulder junction, but I've also noticed it right at the body-shoulder junction, or also much closer to the shoulder-neck junction.
With a fine dental pick (Montana Jack), you can feel that some of the brass is displaced, i.e. its a gouge or cut of some sort. It's not very deep, likely <0.0001" It's not just an irregularity in the surface of the brass. Checking from the inside, I'm unable to detect any thinning of the brass. Out of my last run of 275 cases, probably 10 came out like this. It's hard to notice (which is why it's loaded) and I only picked it up during my post-loading QA check. No problem pulling it apart and tossing the brass, but I'm wondering about the cause.
223.jpg
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