Finland 7.62x39

I have a 7.62x39 from Finland with the headstamp “V P T 7 5”. It has a bullet with a 1/16 inch wide white ring around it aprox. 1/4 inch below the tip.
Anybody have any idea what it is? Someone suggested it might be an experimental Tracer of some sort.

I know it as an experimental tracer, but what the experiment was I do not know…


It is a pre production lot I was told from Finland.