I know most people think of 22lr as plinking fun, but since cheap ammo is not available, but top-quality ammo is, now is the time to focus on tuning your rifles and shooting for accuracy. I get Tenex for $19 a box and it has always been available; the crisis never effected it because its expensive ammo. But its also probably the most accurate ammo on the market. If you decide to get some Tenex, get some from different lot numbers. Eley publishes the average speed for a lot as well, so try some different variations. Its rare that I can't find a gun that won't shoot its best when matched to a lot of Tenex.
Sadly, Eley Match typically shoots almost as good as Tenex for 13.70 a box, but it seems to be largely unavailable. This wasn't the case until recently.
Other good ammo's to try include:
Lapua Center-X. I sold a brick to a friend for $90.
Lapua Midas.
SK Pistol Match/Rifle Match.
RWS R50 / Federal Ultramatch UM22.
If you need a challenge, try shooting the USBR target at 50 yards. Dime-sized groups mean nothing; the 10-ring on the USBR target is only 0.1" across.
If you don't have a USBR target, you can order some from
http://www.pistoleer.com/shooting-targets/benchrest/
If you just want to try it, a 10-bull version is available to print out on 8.5x11" paper:
http://www.southpondcottages.com/metaleer/10Joe-.pdf
http://www.southpondcottages.com/metaleer/10Joe-BLACKa.pdf
Make sure you set the PDF scaling to 100% before you print.