I used to load the "batch" method with single stage RCBS press, started with rifle, then pistol. When I became more of a high volume shooter, shooting matches on a regular basis, I needed more volume in less time and switched to the Dillon 550b, have not looked back since. Dillon is the best in the business, they set the standard for progressive loaders. Their no BS warranty and tech support are best in the business as well. I cannot say enough good things about Dillon. Oh, one thing I don't like is there web site, it kinda could be improved, has some double sliding windows that cause alot of slider pulling.
my 2cents