"While we are aware that some hand-loaders, particularly pistol shooters, tumble loaded ammo to remove residual lube or just to make their ammo nice and shiny, this is NOT a sensible procedure. RCBS and most ammo-makers specifically warn against tumbling live ammo in a vibratory tumbler. Hodgdon’s official policy is: “Completed ammo should not be tumbled. The powder will degrade and increase in burn speed.” (From Mike Daly, Customer Satisfaction Manager, Hodgdon/IMR.)"
How do they get factory ammo so shiny?