Thank you. I must need better reading glasses- or a better memory- cuz I sure did miss that somehow. I'm going back to re-read the article.ditto1958, In the article, I said: "Basically, a Wylde chamber is a favorable mix of a 5.56 NATO and a 223 Rem chamber where any 223 Rem or 5.56 ammo will fire safely and accurately. 5.56 NATO chamber can be reamed with a Wylde reamer to relieve the base diameter. 223 Rem chamber can be reamed with a Wylde reamer to extend the leade."
A Wylde reamer is longer in the throat than a 223 Rem so it will allow the chamber to accommodate a slightly longer bullet ogive like found in 5.56 NATO ammo. The base of the reamer is a thousandth or so larger in diameter than a 5.56 NATO chamber so it will allow a 223 Rem cartridge to chamber without binding on the base.