As a reloader, I've kept a careful eye on reloading components over the last few years. At different times certain components became scarce or even impossible to find. Bullets, primers, and brass cases have all come back in full supply. I remember when finding primers was the biggest issue and those who were just getting into reloading were having trouble finding supplies of used brass.

Gun powder, by far, has been the hardest to find in supply. It has been a solid year since I've seen pistol powders like Bullseye, Unique, and Titegroup. In the last year I have seen a steady supply of rifle powder for calibers ranging from .223 all the way up to .50 BMG. Recently, I have seen a surplus of powders like H335, Reloader 15, and several IMR powders.
I can't remember the last time I saw Varget or ANY powder from Winchester. Of course you can always find these powders for outrageous prices on gunbroker. It seems the same pattern of scumbags buying up the supply and selling at double or triple the price (as we saw with .22 ammo) is still occurring with gun powder.