My pal who is a Class 3 dealer and shoots a lot of belt fed machine guns has a lot of brass to reload for those guns. One of the things he got to make life a helluva lot easier is this slick machine. You can see in the video how it works. It feeds cases and anneals them just like it says. You set the speed and the thing does the rest off of propane. Very simple to use. Adjustable for any case.