Most cases don't need deburring and uniforming, but then there's those that do. I couldn't seat primers flush, let alone full depth, in half of a batch of new Winchester .222 brass. A Whitetail Primer Pocket Uniformer paid for it's self right then & there. Another batch of Winchester .30-06 batch was OK, except for two, and I cut & cut & cut on them. This was a while back, but some fellows over on the Accurate Reloading Forum had problems with Winchester brass this fall.
Some cases have a real burr on the flash hole and a few still have the slug in them, bent over like the lid on a open tin can. I use the Lyman tool. As Mr. Gates said, you don't need to countersink the flash hole, just clean it up.
A few commercial primer pockets have a bit of a military crimp. A twist with an old Lyman Primer Pocket Reamer cleans them up.
Note to newbies. A reamer cuts the sides of the pocket and a uniformer cut the bottom.
The Whitetail tool is carbide and don't wear out. It's the slickest primer pocket cleaner made. Mr. Wright turned them over to Sinclair International.
<a href="http://www.sinclairintl.com/cgi-bin/category.cgi?category=RECPUN&type=store
" target="_blank">http://www.sinclairintl.com/cgi-bin....tore
</a> Since handgun cases last for dozens of reloads and having them cut makes cleaning easier, I do them to. If nothing else, I never have a high primer waiting to slamfire.
Bye
Jack