Lee auto-prime (or the RCBS one).
Lee Auto Prime XR - Accessories - Reloading - Reloaders Supplies Ltd
The tray holds 100 primers and the tool is fast, simple and easy to use. You need to buy the case holder for each case head size (just like other hand primers).
Some plastic parts might wear out about after 6-7000 rounds like mine did, but I just brought another. Never had any major problems but I did use a rubber band to keep the lid on the tray after a while.
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