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Harbor Freight has a nifty little counter sink, 1/2" X 90° , with 6 cutting edges and a 1/4" hex shaft that is perfect for deburring inside trimmed case mouths or removing the crimp in primer pockets using a cordless screwdriver or small battery drill. AND it only costs $2, no shipping.
The first 1/16" of the pointed tip should be ground off to prevent enlarging flash holes when you remover primer crimps. Countersink is a little over an inch long.
EDIT: 10-29-20: Sorry I posted this. After the third primer pocket I gave up on the HF countersink-- it is USELESS. Save your $2 for a better product.
The first 1/16" of the pointed tip should be ground off to prevent enlarging flash holes when you remover primer crimps. Countersink is a little over an inch long.
EDIT: 10-29-20: Sorry I posted this. After the third primer pocket I gave up on the HF countersink-- it is USELESS. Save your $2 for a better product.