F4YG,
They make great sniper rifles for prarie dogs, ground hogs, and coyotes. Basically the equivalent to a .223 maybe a 100' per second slower than the .223. with any given load. The .223 with the faster twist barrels have an advantage of shooting heavier bullets. My preference in both calibers are 40 gr bullets. Light and fast. By the way my duece wears a McMillan sniper stock, so to answer your ? they make a decent sniper rifle.

Rem. 222