Here's the deal...I picked up a nice lot of .303 from a fellow CGN'er. There's some old surplus ball ammo, and lot of Dominion & Imperial round nose hunting ammo. I have to yank some bullets to find out how many grain they are for the different types so I can keep them in their appropriate lots, but some have oxidized lead noses and cases. They would benefit from a gentle trumble, if for no other reason than to clean them up. Some have mild corrosion as well. I know that "theoretically" tumbling live ammo is a no-no, so the next alternative is to yank all the bullets, dump the powder, and just tumble the primed cases. If anyone has done this before, let me know how it turned out for you. I have heard of tumbling media getting into the touch hole and inhibiting the primer. Is that a realistic concern. Thanks in advance for your input.