Just by way of update--turns out the problem was the crappy IMI brass. I broke down and bought (shudder) some used .380acp brass at a gun show today. Reloaded 100 of 'em tonight. No problems with neck tension. Same dies, same bullets, same settings as before.
Now I just need to find a way to scrounge more .380acp brass.
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I am Pro-Rights (on gun issues).
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