Just got my savage 220F a few weeks ago. Scored its first deer today, actually make that a double for today.
The 20 ga is newer than the 12ga and features more like the savage accutrigger. For deer, I see no need for the 12ga, the 20ga in the savage is a 200+ yard gun. They can be a bit picky on ammo, however the recommended Federal Barnes tipped eXpanders seem to be shooting well for me (have shot a 5 shot 1.25" 100 yard group). Amazing for a shotgun. I dont call it a shotgun, I call it a 20 gauge riffle!