I hardly remember ever seeing .357 magnum ammo when I worked at Academy. At least not target ammo. We always had .357 hollowpoints and ballistic tips for hunting and self-defense because it was expensive and the average shooter wouldn't buy it. I only remember us stocking the .38 special in plinking loads. .44 magnum was worse. I think I only remember having the Lever Revolution .44 mag loads and we discontinued selling .44 Special loads. Yet, we did sell .44-40 mag hunting loads and a hundred other oddball calibers.
Side note: I received a half-hearted rebuke after a gentleman asked for .35 Whelen and I said "if we have it, it will be down here with the other oddball calibers" (We kept it with the Krag, Arisaka, Mauser, and other less popular sporting cartridges). The gentleman apparently took huge offense to my description of his chosen caliber as oddball and reported it to my manager, who told me it was hardly worth bringing up. From that point on, I joked with my co-workers that we had to call it the "Non-standard commercialized sporting cartridges" shelf instead of the "oddball" shelf where we put the miscellanea.
Also, agree with Tomas. You can't predict the market. People will buy your entire stock of ammo. Could be .17 HMR, .300 Blackout, or .380 Auto. Some people will find out your delivery dates, call to see if you have it in stock, and buy every box you have. Corporate is slow to respond and you get what they send you. We went weeks without .380. But by God, we had a literal fort stacked 5 feet high with birdshot and .22 Colibri ammo.