I've tried 223 brass as well, just as a fun experimental project doing like 20 rounds. It's doable but lots of efforts. I used a small tube cutter to cut roughly to 26mm, then run through sizing die to form a bottle neck then trim to 25mm precisely on case trimmer. Run into the problem that the 223 walls are thicker, so when the bullet is seated the neck gets wider so it will not chamber. Solved it by running loaded cartridge through sizing die as a last step. Also, keep in mind - 223 head diameter is a bit smaller. So extractor might not have a full grip but it was fine in my Tok.
But why bother? Surplus ammo is around 25 cents these days. With the current cost of reloading components, you will not save anything. I rather spend 10 minutes cleaning my Tok after every session than spending hours of my time reloading it. Because I'm cheap too.