Kinda complicated, so hope this makes sense.
As mentioned, most of the parts between bullet and brass feeders are exactly the same. You need different collator plates and drop adapters (at bottom of springs that interface with press). Thise depend on brass or bullet sizes.
These do pretty well at feeding brass and bullets base down, but every now and then, you will get one upside down. On a 550, youd catch it. On my 750 when im cranking, you can crunch stuff
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If its still not very clear, I can try to get some vids.
Brass Feeder (white, mostly...)
Feeder Body (theres a little slider that you move for diff brass lengths. If case head gets to hole first, it tips the case in. If not, you adjust the slider so the case neck catches until case head falls in hole)
Brass plate (middle had a clutch so the motor spins instead of stripping out middle hole)
Bullet Feeder (mostly gray)
Bullet feeder body
Bullet collator plate for long rifle bullets
Bullet drop adapter (same as brass except smaller ID)
Proximity Switch (shuts off collator to avoid plugging up springs connecting feeder body to drop adapter)
Lee Inline Bullet dropper (better than printed if they have your caliber)