I have this 25x86Rmm cartridge and cannot identify it. OAL is 149mm. It has an inert brass fuze. The protrusion at the base of the projectile rotates in both directions, but does not come out of the projectile. It is solid and not a tracer element. I know it is Swedish because it has the Bofors "B" and arrow stamped into the projectile. The headstamp is KS, a triangle with a crown and ADK in it, and a half circle with three V's on top of it. Can someone tell me about the round?