Please excuse my ignorance on the subject, if anyone, I know you guys will be aware of whether this can be done... 
have a 40x barrel in .222, (no action yet), and I like to Coyote hunt as well as just general range fun.
Never owned a 220swift.... and already have 2 excellent "better than me" shooting .222's.
Is this rechambering more difficult or more costly for a Gunsmith than starting from a new barrel ?

have a 40x barrel in .222, (no action yet), and I like to Coyote hunt as well as just general range fun.
Never owned a 220swift.... and already have 2 excellent "better than me" shooting .222's.
Is this rechambering more difficult or more costly for a Gunsmith than starting from a new barrel ?