This is a Sellier & Bellot Soft Point known as the Rifle chambered in 8MM Mauser, model SB857JSB.
The SPCE is a semi-jacketed soft point projectile with a unique cutting edge built in the jacket. The unique soft nose jacket design partially locks the lead core to deliver uniform" reliable expansion and maximum energy deposit on game targets.
Features:
8MM Mauser
2,591 Feet per second
196 Grain soft point cutting edge
20 Rounds per box