I think the bullet you are talking about are from Hornady, only as loaded ammunition. This was the "Vector" brand, and I don't know if it ios available now or not.
These cartridges showed a trace from the muzzle, unlike military tracer which only starts to burn at about fifty yards or so.
With any tracer ammunition, as with incindiary, they pose a fire hazard and should not be used except under very controlled conditions.
As I recall, these Vector cartridges photographed a bright yellow.
Bob Wright