What a coincidence ... I just asked the same question of my gun club's reloading experts. The consensus seemed to be that a progressive (550B or 650) is the way to go for pistol and for high-volume rifle rounds (e.g., if you want to load a few hundred .223 rounds to go to the range and plink). For highly accurate rifle rounds, though, while it is possible to use a progressive, it takes so many trips in and out of the machine that you'd probably be happier using a single stage. So, I guess the consensus would be to have at least two presses!
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