I have (2) 550-B's that i load some things on but after operating my 1050 and 650 it just seemed too slow to even fool with. Just for giggles i installed one of Dillon's case feeders on one of them. Wow! I should have done this years ago! Once adjusted it's place a bullet and pull the handle. I place the bullet on the case at the powder drop station and rotate the shell plate at the same time. I can load on the 550 as quick as the 650 now. This is a great addition to the manual 550-B. I am going to buy another one and auto case feed them both.