I am a fairly new re-loader and purchased my first instrument in November. I did about 90 days of research on the subject, so finally after I ascertained the opinions, I decided that Dillon was the only way. After speaking to Brian, decided and agreed with his professional opinion on the 550 B. I currently produce .45 and .223, but will add more in the coming months. This may be the route you may want to go. Call or e-mail brian and set up an appointment, he is great and will guide you in the right direction. Go with Dillon!