I use rice. Less dusty than the other media i've used. Main gripe is that sometimes some grime gets in the case rim that rice doesn't clean. I get maybe 3-5 cases per 100 with rice in flash hole. I try to look at flash hole first if hand priming or on my progressive press i have a deprime die in the first spot.
Like that the carbon stays in the neck compared to wet tumbling with stainless pins.