I picked up an older bench rig with a 722 action, 700 bolt and a 1-14 twist unmarked stainless barrel and was told it was a 222. A 222 round will drop in the chamber but would not fire nor would the bolt extract it. Tried a 223 round and the bolt came within an 1/8" of closing but would not, but the bolt will extracted the round. Studied all the wildcats from the 50's and 60's but nothing seems to fit in the gap between the 222 and 223. Any ideas before I drop it off to be re-chambered to a 223?