I've seen a few opened up to 223 and 222's as the Hornets were a bit anemic and the couple I've shot were not what I would classify as accurate. If a 223 reamer would clean up the chamber it might be worthwhile at around $700 as any collector value is long gone. Also, the Hornets have a very specific bolt face and bolt nose and once it is modified you'll never find another one to bring it back to original.
