Give some serious thought to a .17 remington. Currently, Remington and CZ are the only companies making guns in this round. I have a Remington LVSF that is a good calling gun. We don't have many coyotes in my part of Virginia so I'm mainly targeting fox. I'm shooting Hornady V-Max reloads with 24 grains of Varget powder. It does a nasty job on fox if you hit them wrong. I have killed several fox with the .17 remington that had no wounds. I'm going to try some of the smaller grain berger bullets to reduce pelt damage. Another good all around fox gun is the 22 hornet. I don't know what part of Maryland you live in but if it is a heavily populated area the hornet is probably your gun. It will not shoot as flat or as far as the .17 remington. It is good out to 150 yards solid. I would suggest a Browning Micro Hunter with hornaday factory loads. That set-up is a real tackdriver. It has been my experience that the "bigger" (223, 22-250, 221 fireball) caliber just do too much damage. I have not had much luck with the 17 hmr. I don't have any experience with the 220 swift. I have seen two fox run off with 17 HMR rounds inside them. Blood trails at night are not my idea of fun. My "go to" gun is the .17 remington.