I have a Model 70 .22 Hornet which was converted to .222. This is a procedure that Griffin & Howe advertised extensively back in the '50's. Actually, my rifle is quite accurate and a good rifle to practice with, since it looks and feels exactly like all my other unmodified Model 70's.

Conversely, I have a Model 70 .22 Hornet which I had converted back from .222. Not a difficult job, if you can find the correct extractor.

I also have a Model 70 in .30-.338 which started life as a .300 H&H. The previous owner had it fitted with a .30-'06 barrel, which he then had rechambered to .30-.338. He wanted the extra room in the magazine to load the bullets out to maximum length. Shoots great!