Get it setup correct, and it will just run.
I have also found this to be true.
The only thing I stumbled over was adjusting the shellplate. I had it loose, so it would be easy to index, and I was experiencing "cocked" primers, with one side a couple thousandths lower than the other. The rounds fired OK, and the primers weren't "proud", but they weren't level, either.
The shellplate has to be adjusted so it won't turn, then backed off just a little. Then lock the position with the setscrew on the ram.
There are aftermarket roller bearings which replace the factory thrust washer and these are pretty good, IMO. For the extra $5 in parts, I'm surprised Dillon hasn't made this standard.
The comments about lack of auto this and that are valid. The 550b does take more time than "full up" progressives with case feeders and bullet feeders.
It is
possible to pull the handle twice without indexing. I understand it usually happens after being called away from reloading operations by something like a phone call, but it can also be caused by pulling a round out to measure the charge, seating depth, etc. followed by inattention to the process.
I do two things to address the problem of double-charging on the 550b -
- Leave the handle down (mid stroke) if I have an interruption.
- Do all "setup" as single station operations with the locator buttons out. Then, once I start progressive operation I do not stop for "fiddling".
I have had nothing but positive results with the primer system. I had to replace the plastic fingers on the primer magazine once, but other than that it has been 100%.
I still have the small primer parts in a drawer, as (so far) I don't reload any calibers which don't use large primers. I understand this is the hardest part of caliber change on the 550b, and is not addressed by having toolheads set up with dies and powder measures. Some solve the problem by having one 550b set up for large primers and another set up for small primers. (!)
Refilling primer tubes is tedious, but seems to be about the same "pace" as the rest of reloading on the 550b. If you want real production, get a fully-equipped 1050 and a motorized primer tube filler...