I reload several pistol calibers, and several rifle calibers, including .223 to feed 3 ARs.
I looked at the Giraud, the Dillon, and the RCBS power trimmers. The Giraud
I've used the RCBS manual trimmer for decades, but recently upgraded to the Dillon trimmer on my LNLAP, and it makes me giggle how fast it trims .223. I lube the cases, feed the brass in (no case feeder) and pull the handle, then throw it in the tumbler to remove the lube and out comes brass completely ready to load unless it needs the primer pockets swaged or flash holes deburred. The trimmer cuts the case mouth square both inside and out. No burr, so I don't chamfer or deburr. Both flat base bullets and boat tails feed perfectly.
Here is my LNLAP setup for rifle brass prep stage:
1. Run through the tumbler to remove range grit.
2. Lube cases. I use the 12:1 Lanolin/Isopropyl alcohol spray lube.
3.Station 1 is a universal decapper.
4. Station 3 is the Dillon trimmer.
5. Station 5 is a Redding size die, backed off a couple of turns so that it expands the case mouth only. The decapping pin is removed. Many guys don't use the expander, I do.
6. Run through the tumbler to remove lube.
Cases are ready to load.
Once the cases are run through the tumbler to clean off the dirt and grit, I only have to handle them once to do the case prep, then handle them once again to load them up. This is more efficient than even the Giraud.
Except for the autoindexing, your 550B should be able to run just as efficiently.