Like parker51, I too am using a Lyman case trimmer and I HATE TRIMMING .223!
Not to get too far off topic, but it sounds to me like zxcvbob may have a pretty good idea about reloading the steel cases, at least for closer ranges and shoot while moving training.
I've reloaded a box or two just to say I've done it, but wasn't impressed with the accuracy, so I quit before doing any real development.
But NO TRIMMING, heck, I've got buckets of the stuff just 'cause I'm too cheap to toss it.
Oddly enough, the only steel cased Berdan .223 I've run across has been Hornady headstamp.
Swampman