Wondering if anyone has tried the 22-204? It's a 204 Ruger necked up to 22 cal. I'm considering this over the 223AI which I see a surprising amount.
Upsides over the 223AI are single step case formation (neckup and go) plus marginally more case capacity. Downsides are reamer and size die availability, as well as mags need some modification. I see most of the downside issues as one-time issues.
I've picked up brass to test feeding finalize mag modifications.
22-204 with 80 ELDM at 2.620" and 223 AI with 75 ELDM at 2.450":
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