I run a 550B.
Have loaded 40 S&W on it but have moved to 9mm so am loading 9 now.
One of the great things with a 550 is you can run it like a single stage until you get it all worked out etc and then run it like a semi progressive.
I just run the carbide dies and it goes super well.
As said above.
If it's not blue it's poo.
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