Re: more .223 rem qiestions?
I'd wager that the WHOLE problem is that you're crimping AT ALL. It's very easy to collapse the area just below the shoulder, and thus render the case unusable. There is no need to crimp with .223. Your FL sizing die provides the neck tension you need. Try a magazine of rounds that have no crimp, and measure the last one before you allow it to chamber. You'll find that the bullet has NOT moved due to recoil. If the bullet creeps out a little due to chambering, it's not going to hurt anything, unless you're beyond the max. powder charge, and using magnum primers.
Around here, we don't say "Oh shucks", or "oh man". We say Oh BAMA!!