oops on the title spelling.
I have been using round ceramic media for case cleaning. The size is .100X.300. In 45-70 its excellent. In 9mm, the 357 family, and bottleneck not so good. The cylinders get stuck in the case. Its OK if the inside isn't shiny bright. Extra time is needed to get the cylinders out.
I've seen 6mm balls, triangles, and cylinders with angled ends. What size media do you use?