Not sure of your location, but I was calling every store in New Orleans and Baton Rouge, and found RL 22 at the Bass Pro Shop in my area. They had a good supply of everything, plenty of primers (except the elusive Fed 215).
Not sure if you have the Bass Pro in your area, but you could give them a try if you do.
By the way, my local Cabelas did not have the RL 22, and they would not order it for me. I was thinking if they ordered it, I could avoid the Haz Mat fee since it would be in their regular powder order. I was told that I could only have it shipped to my house, and pay the Haz Mat fee, and could not have it shipped to the store.