Back in the 1980's I bought several boxes of plastic cased .38 specials for my Smith and Wesson revolver. They had full metal jacketed bullets with a flat front, more like a wad-cutter. The cases were off white colored plastic, there was a kit that you could get to reload them, I found they were excellent in my gun, very accurate and reliable. You did not need to re size them during reloading as the plastic would bounce back to the proper shape on its own, unlike brass.
As I recall they were made in Washington State. Production was discontinued around the late 80's as sales were poor, people were afraid of the new technology. With time going on and technology taking leaps and bounds since 1987 in our lives, I wonder why no one has reintroduced the concept again?
Sure would make reloading easier, no more case re-sizing, metal fatigue, and use of brass which has been in high demand from China's building growth. I had read an article that the US Army was working on self disintegrating cartridges for a service rifle, I wonder if they were inspired by my plastic .38's?
Anybody remember those cartridges? I don't remember anything like that for center fire rifles though.