Check this out mate.
http://www.300blktalk.com/forum/viewtopic.php?t=88599
Blr243 wrote:Good info. I’m guessing that after this success you would do it all again?
in2anity wrote:JT you inspired me to also try forming my own from 223. I bought a 1.5kg bag of once-fired, mixed hs 223 brass from a popular online store for $40 delivered - about 150 cases, which I thought I was very reasonable. It's a mixture of ADI, OSA, Hornady, Federal, Remington, Winchester, Lapua and a few other odds and ends. .
marksman wrote:because you have gone larger you will find the case necks are thinner and probably pretty consistent in thickness
l would anneal them at least just the once before the first firing
the shortness will stretch out in time