I tumbled primed cases that were leftover from a reloading session three years ago. I cannot see any walnut stuck in front of the primers. Should the old primers be tossed, and have new primers inserted?
I would just load them and shoot them. Believe me if there was any walnut media in front of the flash holes it will move aside real quick when the primer detonates.
I've been tumbling primed cases for thirty-five years. A speck of corn cob or walnut in the flash hole is a non-issue. The flash of the primer will remove it. As to finding out what corn cob will do in a fired case, people where loading cream of wheat and powder in cases to fire-form brass before I was born. It just ain't no thing.
You pose a good question. Note that in the original post fields said that the cases had been primed about three years ago and not used. While the reason for tumbling is not stated, it is likely that in the intervening years the cases had tarnished significantly and they were being tumbled to restore their appearance. They have have also been from a caliber that uses a bottleneck case and has to be lubricated before being re-sized and some people tumble to remove the lubricant.
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