Ya I always keep something in .40 and .357 sig as it seems to be the only ammo on the shelf sometimes. Not my favorite gun to shoot by far, I tend to stick with 9mm and .45 ACP and .45LC
Worst come to worst Ill have to stick with my .17HMR Taurus revolver. There always seems to be 17 HMR (though I am not sure that gun can hit the broad side of a barn yet).
Looking around right now, stocking up on .40S&W, 9mm, .22lr and .380AUTO - My brother asked me to pickup some .357SIG for him.
I have been to like 10 Walmart's and Gander Mountain - No one has .357SIG - It's just hardly ever stocked..
Gander Mountain has LOADS of stock on everything else except .223.