Long before this shortage I find myself shooting 22 a lot more than center fire, both precision and 3 gun type shooting.
22 makes me much more willing to pull the trigger than centerfire, and it's easier to train with without packing targets out to 1,000 yards or needing to go to the range for the full 3 gun setup.
Reloading the expensive ammo helps a lot, other than that stockpile the cheap stuff when times are "normal", then you don't have to worry about the temporary freak out scenarios.