That is the reason I reformed the 223 brass; the 221 is getting hard to find right now. I have a trim die from Redding that I run the brass through first, trim to length, deburr, then run it through a full length sizing die. Yes I turn the necks down to about .011". I do not see or feel any ring on the inside of the neck, so I did not ream them. I annealed this batch. Not sure if I had to or not. I have also done this with some military brass. It is a lot of work, I hope the 221 Brass will be available soon. I have found that the WW 223 brass will not hold quite as much as the Remington 221 brass. The military brass is about the same as the Remington brass, at least the head stamp that I used (TW72). It took me all weekend to form and trim and prep 200 cases.