I have a model 16 that I had re-chambered from 223 Rem to 221 FB. I could never get it to feed from the magazine and I haven't heard of anyone else having any success. I went with a single shot follower and that gun has been responsible for the demise of many thousands of Prairie Dogs.
For a repeater I have a LH CZ 527 in 223 Rem. I had it re-barreled to 221 FB and changed the magazine housing/trigger guard to the smaller size. The folks at CZ USA were nice enough to exchange a 221 FB magazine for my 223 one. This is a great little "walking gun" and is every bit as accurate as my Savages.
A right handed shooter can buy a CZ 527 in 221 FB right from the factory.
Charlie