I use one of the LEE brand de-caping rods, the ones designed for manually hand de-caping cases by setting them in a small steel base.
The rods come in two sizes 22 cal and 30 cal.
I just use the rod, no base and push the pin into the primer pocket knocking the corn cob blockage out the case mouth.
I started unplugging the flash hole with a long pin but the pin was too thin and would sometimes pass by the blockage rather than push it out, so I found that the pin on the LEE de-caping rod did the job.
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