Normally I don't respond (daily) to requests to link on this blog. To be honest, most are simply not worth passing on, while some are downright obnoxious. This time, I think it's worth putting out there. Luck Gunner seems to have run a pretty expansive test comparing .223 ammunition in brass vs. steel casing. One reason I'm linking it is it mostly matches my own observations, although I certainly didn't blow 40,000 rounds through three sacrificial M-4geries. So.... here goes the link, and enjoy the reading.