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The auto priming tool uses/borrows the same shell foot as does the single stage press.
That hole in the shell foot allows one of the above primer rods to push the
primer up into the primer hole and properly seat the primer in the case.
You get two primer rods and primer tubes, which hold up to 100 primers, to accommodate both
the large and small primer sizes used in reloading.
It takes two strokes of the handle to prime a brass case using this tool. The first stroke drops a primer from the tube into the primer rod assembly and the second stroke, upon your inserting an unprimed case into the shell foot, seats the primer into the case. I like this process because the primer is seated on the down stroke of the tool's handle versus the up stroke as is required on most single stage presses.
Now, speaking of priming tools, let's spend a minute or two and see how the primer tubes are usually loaded. A primer tube is used by many bench mounted priming tools and presses to hold the primers while they feed the primer into position for seating into the brass shell case.
Primer tubes come in different designs that are unique to the tool they were made for....however, they all serve the same basic function....they allow you to load a stack of primers to be automatically fed into the priming tool or press.
You'll need a $6 primer flipping tray unless you want to spend way too much time handling the primers (which is not desirable since you can run the risk of contaminating the primers which result in a misfire). Just for the record, you would have to have some pretty oily fingers in order to render a primer useless by touching it. No doubt someone with case lube dripping off their fingers has managed to do so
Last but not least, you'll need some primers. They come in large and small
pistol and large and small rifle. They also come in standard and magnum
"strengths". Magnum cartridges, such as the .44 Magnum, do not necessarily
require a magnum primer. Magnum primers are intended for use with specific
brands of powder that require an extra hot flame to properly ignite them. Follow the recommendation of your
reloading manual (you do have a manual, right?) regarding the type of primer
required for the cartridge you are reloading.
To start, open the box of primers and put their packaging tray in the palm of your hand. Lay the primer flipping tray (the half with the molded rings in it) over the packaging tray. Holding the packaging tray and the flipping tray together, invert your hand and remove the packaging tray. If you did it correctly, it should look something like the above photo.
Next, gently shake/move
the tray in a somewhat random fashion. What you are doing is causing the
primers to flip over as the edge of the primer catches on the ridges in the tray. The open end of the primer, with the
sharper corners, catch the ridges in the tray and cause the primer to flip over.
When the primers appear as shown in the above photo, you have them all in the
correct position. Place the lid on the tray and invert the tray.