LOTS of early production and semi-custom .22 CFs have undersized bores. I had an early Savage 219 (Utica-made in late 1930s) that originally had a .222 bore. I inherited it from my uncle after he'd had it rechambered to .22-.30-30AI....you can imagine the accuracy with THAT! (I had it relined into a .25-20WCF, which really shoots).