Thank you. I have found a few loads that reference Fiocchi hulls, but I cannot find those.

I use Cheddite or Fiocchi, but stick with one (or the other) as it requires readjusting my press (9000) Fiocchi doesn't last as long, but I don't push my hulls beyond 4, maybe 5 cycles.
As an aside, I recently bought a Grabber (for 2.5" 20ga), and like it way more than the 9000.

Graff usually has them, as does BPI, but in 2.75", and I trim them.

I picked up some HS6 for 28 ga loads a couple years ago, but have yet to try it, 17.1 gr was the recipe.
I've got enough 20/28 to last me a lifetime since I mostly hunt, and don't shoot many clays.

20/28 is a great powder but the pressures are very high when used in the 28. There are better, cheaper and more available powders for the 28.

Cheaper means larger quantities. You can buy Unique in large kegs, if you can find it.

Good luck finding Unique. You'll have much much better luck finding Longshot which works well in the 20's and 28's and is cheaper.

I used WIN 540 for a good many years HOWEVER they don’t make it anymore . BUT Hodgdon HS-6 is said to be the same thing and the loads are about the same . I’ve also used Unique .

As to hulls talk to Mr. Steingraber he might be able to help you out with some Remington 28 gauge STS hulls .

13g Unique, 13g Longshot or 14g Longshot are all good charges with 3/4 oz loads in 2 3/4” hulls.