I can tell you one thing for certain, here in Western PA the run on small and large pistol non-magnum primers started during the summer. First the CCI's went missing, then Winchester and now not even Federal are available. The LGS's I usually get all my primers from have nothing but rifle primers and a few 209 shotgun primers left on the rack after last week.
Checked Powder Valley, Natchez, Graf & Son, Midway, and a variety of smaller online vendors- S-O-L for small pistol at this time. Luckily, I have a decent stock for my winter reloading, but I hope to be able re-stock sooner or later. I may try some small rifle primers in my .357 mag loads with Unique and 2400 since neither require magnum primers.