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Old November 21, 2007, 02:52 PM   #6
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 21,024
Whiplash,

How many reloads do you have through these cases? It sounds like they are going into the neck sizing portion of the die, then springing back out to near their fired dimension. I've had that happen with the thin mouth Remington .45 ACP cases. It means the brass has work-hardened and you need to anneal the necks. Even if you find a workaround (no expander), hardened necks will start splitting soon if you don't anneal them.

If the issue is genuinely overly thin neck brass and not annealing (this would mean they never resized properly after their first loading), get a Redding S type sizing die (either FL or Neck Only, as you prefer) or a Forster bushing die. Both use neck bushings you can buy in different sizes to get the neck sizing you need. A less expensive alternative is to by a Lee Collet Die which, with some practice and adjusting, will let you perform a second sizing operation on these cases, pushing only the neck down to the size of its mandrel. If the necks used to resize OK, though, and are springy, you will still have to anneal them to make even this work.
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