??? Well, the bore is the same so yes... The problem is that the actual chamber dimentions are enough different, that part of the barrel will need to be cut, rechambered, and re threaded. Depending upon the contour that may be difficult, and you will lose barrel length. With a Savage, the question becomes why not just buy a new barrel?? Unless you have a friend in the biz, it would be essentially the same price, and you get to keep the 243.