I like the sinclair models. Chuck em in a drill to do a bunch
or do by hand. Solid Tungston Carbide, they last forever.
They come with a small plastic cover that makes for good
grip if used on the back when you don't want to use a drill.
http://www.sinclairintl.com/product/11248/Primer-Pocket-ToolsOnce you have the primer pocket uniformed they then work great
to clean the primer pocket on successive reloads.
Better than brushes, tumbling, etc.
By keeping the primer pocket at the proper depth you not only
help with accuracy, put help prevent high primers that can
cause accidents in revolvers and others.