DoubleTap Ammunition Hardcast Solid, 357 Magnum, 180Gr, Hard Cast, 20 Round Box 357M180HC Finally, a serious, heavyweight load for the .357 Magnum for the woods and hunting! These hardcast LBT-style bullets create wide DEEP wound channels for hunters and those concerned with woods protection. Velocity is from a 4" bbl. From a 6"bbl average velocity is: 1425fps!