This is a Sellier & Bellot Soft Point known as the Pistol chambered in 357 Magnum, model SB357B.
Soft Point" Jacketed Soft Point" and Semi-Jacketed Soft Point projectiles are designed to deliver deeper penetration with less expansion than semi-jacketed hollow points. These projectiles are designed for recreational shooting and hunting small to medium sized game.
Features:
357 Magnum
1,263 Feet per second
158 Grain soft point
50 Rounds per box