The way the supply on everything has been lately, it is a no brainer. You've got to have at least a two year supply on the shelf or you've got trouble when they decide your particular toy doesn't warrant the same level of production. The scramble seems to commence every time that happens lately. I have been hit by the 405 win going down to 1 factory load( brass and ammo was sold out for two months or more), and the 7stw seems to be that way now. Win isn't making brass anymore, and rem went to seasonal.
I keep at least 200 rounds on the shelf loaded for each rifle. I cast for the 30, the 375, the 405, and the 44 pistol, so I will always have at least some access to bullets.