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Only complaint is that primers bounce out of the cup and on to the floor.
I was having the same problem with the Rockchucker, all i did was back out the pin some so it didnt hit the primer with so much force and they all pretty much stayed in the cup. Also added a small foot mat on the floor underneath where i realod in the garage so the ones that did bounce out just stayed on the carpet and didnt go for a ride on the cement.