RCBS makes two different bench primers. One loads one at a time. The automatic bench primer hold maybe 50 or so primers in a tube like the press mounted tube. Shell holders are the same ones for the press. Push down on the handle to put a primer in the cup, lift handle a couple inches and put case in shell holder, then push down handle to seat primer. It has a very easy to judge feel. I used a friend's and was so impressed that I won't do primers any other way. The only way you can do them faster is on a progressive, but then you don't really know if that primer is going in right side up or sideways, or even upside down. With the RCBS automatic, you're looking at the primer as you put the case in the holder. I lost my lee hand primer and spent a LOT of time looking for it. I should have spent my time trying to find the automatic bench primer. Never again will I prime any other way. AND it's fast!