I had an RL450, purchased many years ago and upgraded to 550 with their kit about 2004. Countless rounds came from the press.... .44, .45LC, .45acp, 45-90, 44-40, .357. The press got sloppy loose lately. Ram wobbled in frame, auto prime continually malfunctioned. Boxed it up and sent to Dillon, knowing it would be repaired no charge, other than what the shipping cost me to AZ. That was eleven days ago. FedEx delivered a box this morning containing a NEW RL550C.