[Quail1]

I want to load some quail shells for my GHE 20 ga., it has special steel barrels.

I've run out of Universal, 20/28, and now SR4756. I checked everywhere locally today and was skunked.
But I have plenty WSF, Longshot, HS-6.
What pressures would you expect I could shoot through this gun? Can it handle something in the way of an AA target load?
Will I be able to load appropriate shells with any of the powders that I have on hand?

Thoughts and advice?