Oh it happens frequent enough. Some guy's won't fit a barrel, they simply have several frames and try barrels on different frames till they fit
That is exactly what I do. I keep 3 spare frames to try new barrels on. Of all the Handis you see below my signature, as of this date, none are shimmed or tweaked. Some were originally, but as I acquired more frames, I was able to swap barrels around until they all fit. I too have been very lucky with the barrels I bought here. My big problem is I have three frames and 3 stock sets......what barrels to put on them. I'm kinda lusting after a .32-20 for one. Perhaps a .444 and a 22" 12 ga.
Good luck with the .223, they're shooters.
Pete