The 220 Swift is a relatively old cartridge, so ammo can be a little harder to find. It shoots a .224 caliber bullet (same as a .223), just has more powder behind it. I would group the 220 Swift in about the same category as the .222, .223, .223WSSM, and 22-250. They are all excellent varmint rifles, but some states don't allow them for deer. I hunt with my .223 (legal here in Texas), and it is deadly on neck shots at close ranges. However, for a dual purpose rifle, a .243 or 25-06 would probably be a better choice. Factory .22 cal ammo is usually limited to varmint bullets. The larger .243 and 25-06 ammo is readily available in deer and varmint loadings. Winchester has come out with .243WSSM and 25WSSM rifles that are shortened versions of these cartridges.

Hearing protection is a must on nearly any centerfire, and a 220 Swift is no exception. I don't know how many make 220 Swift rifles, but nearly all manufacturers make rifles in comperable calibers. The rifles did have a reputation as barrel burners, but I think most newer rifles shouldn't have that problem.