Yes I used distilled water and an additive the tumbler came with. Tumbling with Stainless Steel pins works on smaller ammo, .50BMG and down, but for the 37mm the shells where too heavy. It drove the steel pins into the rubber liner, the steel pins where driven into the rubber liner and the ends where still sticking out so that the 37mm shell was scraping against them. I tried with just one brass case at a time and with 3 brass cases at a time. I just use regular walnut and concorb media in the tumbler now and set for 3 hours. It takes some of the crude but not all. I still have to polish the outside with a red Scotch Brite pad made for metal, takes just about five minutes of rubbing by hand and they are shiny again. I only use the tumbler now just to try and knock some stuff off of the inside. Hopefully when I go to shoot these it will take more of the crude off of the inside. Happy Trails.
Starvingboy wrote:... when you tumbled the brass in stainless pins, did you add water and soap as well?
I'm curious, as I use stainless tumbling for my reloading. I only go up to .50 right now, but I do dream of moving up to the big stuff some day. That sizing die looks intimidating.