This is somewhat like another youtube video I saw, where a guy modified a .308 Dillon Rapid trim die in order to trim and form his brass. I tried the same thing, but had an issue with the cases spinning when the neck of the .223 case contacted the cutter since there was no support for the case. End result was a pretty torn up case head. I tried a bunch of different things and finally came up with the solution of snipping the the neck off with some sheetmetal snips. This tweeked the shoulder area of the case, which made for unreliable feeding on my progressive presses feed tube, so I fixed that by tweeking the neck back with a pair of needle nose pliers.
Probably not the most elegant of solutions, but it worked for me.
Here's my crappy video. Not sure why I was pointing the camera in a weird direction hopefully you guys can tell what's going on. Sorry I don't know how to embed.
http://www.youtube.com/watch?v=ea1eNhQvsFQ
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