I have had my RL 550 B scene the early 1990s. I have had a few problems with it over the years but haven't had problems in a number of years. I haven't loaded any thing on it in about a year, I have recently started loading some 45 Colts and started having problemsn with the powder measure. I called Dillon and explained my problem and the said did I have the up grade fail safe powder measure, they ended up sending me the up grade with two new powder bars and a new actuator rod no charge, they are a great company.