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I use the Forster inside neck reamer to form my 300/221's, here's the steps I go throught:
1. Cut the 223's down to approximate lenght BEFORE you form the neck. I use a sanding disk in the drill press. Use a block of wood with hole bored in it to hold the brass while you gring it down.
2. Deburr the mouth of the cut down cases.
3. Lube them and run them up into the sizing die WITH the .308 expander ball installed.
4. Use the Forster inside neck reamer installed on the case trimmer to both ream the necks and trim to proper lenght in one step.
5. Deburr them again.
6. Resize them again.
7. Load and enjoy.
Sound like a lot of trouble, but it really doesn't take too long. Sometimes shooting a wildcat requires a little piddling time.
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