what you are searching for does not exist, all the brass makers make them undersized from the mythical .473 some are worse than others. in 22-250 brass Win. and Rem. brass are the worst coming in at .462 to .463 in the lots I have.
Norma and Federal are the biggest my lots of both are .466.
I was so frustrated by this problem on my first custom rifle
having a whopper oversize chamber (.473) that I spent countless hours making 22-250 brass out of .243Lapua brass that measured .469
since that time I have realized the best way to go is to have your own reamer made to fit the brass that is available.
If you are going to use a factory chamber Fed. or Norma are your best bet, if you like the hoola-hoop around the ankles look then Win brass is great.