Dennis, I have no feel for the market right now. You'll have to do a quick overview in the reloading forum--I think they have a thread or two tracking supplies and availability.
After the last shortage, I stocked up on my desired powders and primers--I have enough brass and bullets that I am in good shape, probably for the rest of my life. Health issues have slowed down my shooting a lot the last two seasons. I am better this year, but I am hardly shooting 500 rounds a month.
That 900-fps load I mentioned above also seems to be a good round in the Night Guard 386 that has graduated to being my bedside gun. 2 1/2" barrel, 7 rounds, lightweight (but not like a j-frame). Yes, that is a 357 case for my recipes--but others have done it in 38 Special cases.
Personally, I now load all my 38 Special max loads to the European specs--which is equivalent to 21,750 psi. My guess is that any US-made 38 Special revolver made since 1981 meets that spec--do we really think manufacturers ran two different cylinder specs for revolvers sold in the US or sold in Europe?
Incidentally, for these shooters of j-frames in 38 Special-only should use google to find the discussions in the S&W forum about the "FBI load" and duplicates of same. It is an excellent discussion of higher-and-high-pressure rounds loaded in 38 Special cases, particularly using SR-4756 propellant, and of the changing nature of "official" 38 Special pressures.
I may even see what some DEWCBB rounds loaded up with a standard-type case depth look like. In hardcast.
Jim H.