The 223 cases and 222 is to small at the base and the hole idea abouth making luger brass from them is not very good.
Years ago when we hired out guns for movies we converted H&K and Glock pistols to blanks.
We did also convert som e WZ23 subguns to blanks
We made our own blanks from 223 military ammo that we shortend down in a lathe and starcrimped in home made tools.
We shoot a bit full auto with those and sometime sit worked ok.
But there was uite a bit of jamming as the rounds did not stack correctly in the mag nor do do the extractor hold them good enough.
So Steve and others, stay away from 223 as a basic case and buy instead the correct brass from whoever makes it.
Regards HÃ?Â¥kan
http://www.vapensmedjan.com