The Carlson's Core Series Extended Choke Tube was carefully designed to be dynamic enough for everyone from novices to experienced hunters, without sacrificing any quality. Designed for all shot types and most sizes, the CORE Series is perfect for a variety of outings - from hunting doves, ducks, pheasants, geese, and other small game, to shooting trap and sporting clays.The Core Series is rated for Shot sizes: BB-10 in lead, steel, bismuth, Tungsten/TSS, Matrix Loads, Duplex Loads, blends, and Hevi-Shot may Be Used in ANY CORE Series Chokes. Close Range/ICLead Yardage: 5-20Steel Yardage: 15-30Shot Size: ANYMid Range/MODLead Yardage: 20-35Steel Yardage: 22-45Shot Size: BB-10Long Range/FullLead Yardage: 30-45Steel Yardage: 40+Shot Size: BB-10