One bulk pack ammo that did work well for me is the Federal stuff made for autoloaders that comes in the 325 round packs. It was relatively accurate at 100 yards, consistent, and reliable.
But between the two, I'll just buy 500 rounds of CCI mini-mags. I prefer solids - a .22 LR solid can make it into the passenger compartment of a car with a direct hit on the door, sometimes out through the other door, if need be. I've seen JHP bounce off of a car side window and fail to stop a feral diseased housecat with a shoulder hit. I'll take the CCI solids any day of the week over other options - they work every time and are more likely to punch into something that will stop a game animal or a threat.
IIRC, mini-mags cost about $7 for 100 rounds. That's $35 for 500 rounds. It's not that big of an investment, especially if you think you might ever have to rely on it for food or protection.