I'm new to reloading and need a method to polish my brass. I've heard of several options such as tumblers with corn cobb media, stainless steel media, vibratory tumblers, etc. Can anyone tell me the basics of one of these devices and what I'd need for my purposes and what the differences are between these set-ups? I'm reloading .308 and .223 mostly for precision. I'll do pistol ammo in the future but I want a good quality system that's going to last. Thanks!