The 220 Swift can definitely be a tough round on barrels. Especially at the chamber throat. Check it out closely before purchasing, or better yet see if the seller will let your gunsmith check it out.
The 220 can last a long time, with little or no erosion, if loads are kept to lower velocities. With the large case capacity, many reloaders pushed this cartridge to it's maximums, and the result was either setting the barrel back, or replacing it.
I have a good friend who has a model 70 from the 1960's chambered for 220 and it has never been pushed over 3800 fps, with 50-55 grain bullets. It still has a good barrel, and shoots dime sized groups at 100 yds with ease.