Ruger and CZ offer controlled feed [Mauser extractor] .223s.

The CZ527 is no battle ship. I have blown the bolt face off one or two of them with overloads.

A Ruger #1 falling block is much sturdier when the case head fails.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps