...yes, I use a flash-hole deburring tool... one time on new brass. It's an easy thing to do, and adds to uniformity. Just a suggestion, trim all your brass to the same length before you do the flash-hole, since the tool "headspaces" on the case mouth....

"Progress, far from consisting in change, depends on retentiveness..those who cannot remember the past are condemned to repeat it." Santayana