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Forgive, there is .015625 difference between drill diameters when the set is in 1/64th. Back to keeping up with the diameter of the flash hole, If I fired a case and the diameter increased .015” I would determine what went wrong, back to the first part, if the flash hole increased in diameter .015” other signs of pressure would be obvious.
A letter and or number set would be a better choice, harbor Freight, then there is the big box of drills, $120.00 plus.
F. Guffey
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