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That's how the flash hole gets installed- they punch it thru. Lyman makes a flash hole deburring tool that costs under $10.00. It's a no brainer to use and will straighten up the burrs pretty quick. For most handloading, the flash holes aren't a big issue. If you are having accuracy issues or looking for better accuracy, flash holes CAN make a difference. Sometimes it's worth the work and sometimes there isn't any difference.
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