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UNDERSIZED sizing die??????????????

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UNDERSIZED sizing die?????????????? Empty UNDERSIZED sizing die??????????????

Post by Cmysix Sat Feb 10, 2024 5:58 pm

WHY? if you will. would I need/use an undersized sizing die , like say a .45 acp sizing die that is 0.003 small then a normal .45 acp die? TYIA.
Cmysix
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Post by NuJudge Sat Feb 10, 2024 6:22 pm

If you have a full length size die that produces a smaller than usual OD on a case, this is useful in two circumstances, one is with standard brass producing higher than usual neck tension.  The second is that with thinner-than-usual brass (I have lots of old Remington like this), normal neck tension is achieved.  

For normal brass and soft Lead bullets, this does not work.

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Post by bruce martindale Sat Feb 10, 2024 9:51 pm

NuJudge has it, thin brass, jacketed bullets, maybe for very heavy loads to prevent heads from backing out?

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Post by chiz1180 Sat Feb 10, 2024 10:05 pm

I use an undersize die for 9mm range brass. It is useful for brass that may have been shot in a loose chamber. In my application, it allows for correct tension on the projectile.
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