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To upgrade from 450 to 550c, there are 3 different upgrades: Frame, auto primer and auto powder drop. Is this correct?yes, considerable
adds the auto feed primer & powder funnel function
what REALLY makes the 650 shine IMHO, as another step, is the case feeder, which IIRC has now been configured to work on the 550b.
I started on the 450 about 40 years ago, & never had a single stage to this very day.