The .222 Remington is, as has been previously stated, one of the most inherently accurate cartridges ever developed, and was the only competitive caliber in bench rest competition from the time it came out until the relatively recent introduction of the .22 PPC. The .222 Magnum was developed from it (slightly larger case), and the .223 was developed from it! Brass is readily available (Winchester makes it, Remington makes it, Privi Partisan makes it, heck, almost everybody makes it), and, if you can't find some, you can make it by resizing .223 cases (probably not a good idea if you have a rifle in .223, though). Yes, the .223 is a bit hotter, but it does not have the accuracy of the .222, and the net effect downrange on small to moderate size critters is the same. The primary reason the .223 became so popular is that, for quite a few years, military surplus ammo was available for the .223 at dirt cheap prices. I like my .222s, they are so nice to shoot, and extremely accurate. If I anticipate shooting out beyond 300 yards or so, I use a .22-250, which has a lot more oomph than the .223. Yes, the .222 Remington is a classic cartridge which will pay off with extremely good accuracy.