One would have to reach for SG HeviShot light mag or mag load to extend useful range of heavy pellets by about 10 to 15 yards. Those even in tactical 2&3/4" loads are not suitable for use in LC Smith shotgun. The Federal Truball and Truball Penetrator slugs produce very nice groups in smoothbore with SK choke. Standard low velocity (low recoil) Truball would be excellent choice for older shotgun the Penetrator is hard and would likely "ring" them barrels too much.