The RCBS® Hand Priming Tool not only seats primers quickly, a safety mechanism separates the seating operation from the primer supply to reduce the risk of tray detonation. It fits in a reloader’s hand for portable primer seating and primer tray installation requires no contact with the primers. The tool uses the same RCBS® shell holders (post-1980) as RCBS presses. It’s made of durable cast metal and includes large and small primer plugs.
I have been using this priming tool for 20+ years and love it. It does a very good job of priming, once you get the feel for it. There are a few tricks, like holding the unit at an angle so the primers slide into the slot. Also it helps to lightly shake the unit to ensure the primers slide toward the slot. The great thing about this tool is you can feel the primer being seated, and can tell if the primer pocket is too loose, or too tight. Or if the primer is bad. It is also portable so you can prime cases while watching your favorite movie. The only thing I do not like is changing the shell holder for a different caliber. That requires a lot of disassembly.