Got my new tumbler and all the goodies and just had to try it out. Got back from the range and shot 40 and 9 and had an equal amount of brass and threw them in the new toy. Went out and checked 2 hrs later and guess what. Yup every 3rd rnd of 9mm was stuck inside the 40 S&W.Dang what a pain in the butt that was and a hour wasted pulling them apart. Yup I felt like a sack of wet mice.