I have a .22 PPC as well, I haven't shot it in years and am just getting back into varminting, so this is of interest to me. Fortunately, I have about 225 piece of Sako brass that is 2X fired that I bought back in the mid-'90's.
It appears Sako still mfgs. this brass and loaded ammo, but it isn't imported into the US. Surely there are enough .22 PPC shooters out there to warrant importing the Sako brass. It's a great round and I'd buy at least 500 pieces just to have a good supply of brass and not have to worry about finding brass again. I hate having to fireform cases, if you want to form a large number for varminting, it's just unnecessary wear on your barrel, IMO.
