This above.
Unless you are using ball powder the amount of powder in the flash hole will be miniscule and of no consequence. How much powder are you seeing?
If in the flash hole I wouldn't expect more than a kernel.
If it's powder stuck for some reason in the base of the case use as suggested, a small brush. Has lube somehow got down there?
I would then resize the cases, with depriming pin removed, to re-establish consistant correct neck tension.
I presume you wore safety glasses when you gazed down inside the case and saw the powder?
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