223 wildcat

I recently ordered a quantity of primed .223/5.56 cases that were supposed to have been pulled down as part of a de-mil operation. I was attracted by the price, but the Condition of the cases, Diversity of headstamps, Some (but not all) of the military brass had the primer crimps removed by...

So I'm thinking again (dangerous, I know) about building a rifle with better performance than the 300 blackout in a bolt gun, but following the same idea. I recently heard about 30 Apache ( not 7.62x40wt) that is supposed to be a 223 case necked to 30 cal. I threw a few 223 cases thru my 308...