$100/month for factory 9mm ammo ….
Or spend $ 1,000 for reloading equipment PLUS $50/month for components.
The 550 sounds like the way to go, but an alternative is NOT to GO at all.
You won't save much by reloading 9mm Minor, in the current environment.
Reloading becomes more important with .40 or 9mm Major, but for now,
you could save yourself a hassle
UNLESS
it gets more difficult to purchase ammo next year.
No suggestion here, merely an alternative viewpoint.