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The trick is to ream the inside of the necks if you use .223 brass. I use an old Pacific case trimmer with a Forster inside neck reaming bit. The bits cost less than $30.00
I use my old Shopsmith with big sanding disk to grind the .223's down to within a few thousands of finished size. I bored a hole in the side of a 1x2 wood block to hold the cases. I set up the stroke of the tool head to stop at the right place. I suppose you could use a drill press to do the same. At this point, the cases look a little like 30 Carbines....
Next I deburr using a standard deburring tool. Then I lube the cases and run them up into the sizing die.
Using the old trimmer with the inside neck reamer and a cordless drill to spin the cutter, I ream and trim all in one step.
Deburr the cases one more time and I'm ready to load. Needless to say, I've goofed up several cases getting things set up correctly, but .223 brass is relatively inexpensive. I can crank out 100 in an hour or so!
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