I wouldn't call the .222 remington obsolete. Savage just announced that they will be chambering their model 25 in .222 remington. I intend to get one when they become available.
Buy bulk brass from midway.com and reload, and ammunition will not be a problem. And if bulk .222 brass becomes unavailable, RCBS sells forming dies to make .222 remington from the ubiquitous .223 remington.