Rifled slugs are designed for smoothbore barrels. A more open choke would be better than full but it should not hurt the barrel. Do you have another shotgun that you can use? If it were me I would put that model 97 on the wall and leave it there. If you could find another barrel with a more open choke you could use it for any small game or birds or big game. Just my 2 cents worth. Good luck.