It's a trick question.

Those of use who are fortunate enough to know Hammer know he only shoots one cartridge through his Savage's - the 220 Swift. We also know that over the years he has bought up every Savage barrel in the country chambered in .220 Swift. Therefore there's no way we could possibly assemble a replacement rifle that is identical in every way because there's no way we would be able to locate a replacement .220 Swift barrel.

Wait...what's that I see in the distance down on vendor's row? Could it be...maybe...possibly? Nope, false alarm...that's a dusty old .219 Donaldson Wasp barrel.