Rock Chucker: You can get a bushing and remove the bushing in the Rock Chucker that the dies screw into and replace with a Hornady conversion bushing to use the Hornady die bushings.
However, unless the Rock Chucker now has a spent primer tube and bottle to catch all spent primers, it probably still throws spent primers all over the floor.
If you think you might want a Rock Chucker, consider the Hornady Classic L-N-L single-stage--or the Lee single stage press. Both will reload as well as the Rock Chucker.
To me, a single stage press would either be the Lee Challenger or the Forster Co-Ax and forget the ones in between.
550B: Stop and look at the 4 stations and manual indexing and the high cost of the press and caliber conversions. It is a very limited press for the money. Also, when I used a 550 the cases still entered the shell plate to my right and this involved me manually inserting cases in the on-press case feeder (as I remember) with my right hand. This was a pain to begin with and was even worse if I had been sitting down to reload (as I do now).
If you need a case feeder for the 550B, and I would, it would seem to make more sense to invest in a much more capable press and get a 650 with case feeder.
As you can see, my needs and wants may not be yours, but you need to consider the weakness of each press over the strengths of each press as it is the weaknesses that will drive you crazy.
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