Find yourself in DFW and needing Tracer ammo chambered in 308 win? Or maybe you have something specifically chambered for 7.62x51? This ammo will function in either chamber. I bought these rounds on The American Marksmen website just over two years ago. Recently rediscovered them as they have been sitting in some ammo cans untouched for quite some time, as the rules regarding tracer ammo around DFW boil down to "not here!" leaving me little choice but to sell the ammo.