Then there is the Improved Zipper........
All good, easy to live with 30-30 basic brass, rimmed choices, if you cant get the .223 to do what you want, as is, with handloading.
You can probably buy all the stuff off the classifieds 'right'; you already have the brass; you might even know somebody who is already set up for this caliber (you do have a local 'Rod & Gun club, dont you, they are your friends).
For my 'bang for the buck' reloading that .223 down, and Win. White box for top would be hard to beat. No machining or restamping caliber neccessary.
Pop the ejector apart and tune per the FAQs, complete with a BB to increase spring tension. Try it, if its cured, great, if not, wrap some 400grit wet or dry paper in a split dowel, spray with some WD-40 and lightly (emphasis on lightly) the chamber, staying out of the shoulder and neck.