This is why you start out with a single stage. Once you get confident in all the operations, you move up. Quality control is the most important part of reloading. Progressive presses can run a lot of rounds fast, but also a lot of rounds that are wrong. Starting out slow is safer. I started out with a lee turret press and moved to a 550. Got a double charge and lost a sweet S&W 65-4. Then went to a 650 and got new challenges. The faster they run the easier for mistakes to happen. Mr. Scuba is right on the money.