There has been a lot of work on frangible bullets and "blended metal" is just another name for most of that. Powdered copper, iron, tungsten and other stuff is mixed with a binder and molded into a bullet shape.
I did some testing with an earlier 5.56 type into gelatin and it is spectacular but I'm not sure the technology is legal for combat use or ready for prime time.
I did some testing with an earlier 5.56 type into gelatin and it is spectacular but I'm not sure the technology is legal for combat use or ready for prime time.