Re: Tumber Media
i buy quite a bit of once fired brass and sometimes my tumbler is running 24/7 for weeks on end. i change the brass every 12 hours. after the media gets the green color (1K rounds or so) it will not clean brass in 12 hours like the newer media. it helps to run brass polish in it, tho
but if you get your walnut or corncob at the pet store, it is cheap enough to change out often.
i run old discolored brass in walnut for 12 hours. i clean loaded rounds in corncob for 30 to 45 minutes to get the resizing lube cleaned off.