I think that might have been me,
Weldon DB 8 is a 60* De-Burring tool that STOPS cutting.
No (Zero) cutting flutes like counter sink cutting tools have, so to don't take off too much material.
Once the brass is stamped for a lip retainer for the primer,
Then punched out backwards with the primer,
Its nothing but a 'Burr' sticking out in the way, even if you swage it off to the side, there is still a groove to snag the primer.
A quick trim to remove that burr and potential snag point with something that is more or less self limiting,
Leaves a nice, small 30* taper (60* Included) works pretty good for me,
And I've been cutting metal for over 40 years.
The DB (De-Burring) #8 with 1/4" shank works well in power tools, or a collet type hand tool,
Works on both small & large primer pockets.
With the pointed nose, it finds the flash hole on large primer pockets and gives you a good clean trim that is completely self limiting and centered,
While on small primer pockets you might have to try a few to get it just right with power tools.
I spin them about 250 RPM currently on an automatic case prep machine and they give a really good, clean, FAST trim to both large & small primer brass.
