If you just use the right grade of corncob media to start with, nothing gets stuck in the flash holes and everything is a lot easier.I dry tumble off the lube and then uniform prime hole. To get media out of case to start, hold against the rim of tumbler and vibrate media out as I take cases out of tumbler.
FWIW this Lyman corncob media I tried recently sucks though; lots of chaff that gets everywhere, and it sticks in flash holes too. Typical of Lyman, they outsourced some cheap Chinese garbage instead of choosing something that works right. I won’t by any more of this junk.
Good corn cob media, in comparison, doesn’t make a mess like the Lyman junk does, and if it’s sized right it won’t get stuck in flash holes. My old source went out of business so I’m looking for a new supply of it.