I use brass in my target rifles and nickel in my hunting rifles. Once I find a load I like in a particular hunting rifle, I load up several boxes with that load and put them away. I've gone back YEARS later and pulled this ammo to hunt with and the ammo looks new as when I put it up. Not so with brass, even left in the boxes.... go back several months from now. while not corroded, it's dang sure tarnished and it's not going in one of my pretty rifles if it ain't pretty!!
The thing to watch out for with nickel plated brass is to check the inside of the necks before you load them the first time. I've seen some with "grit" trapped in the finish which will not bode well for accuracy. a bit of steel wool on a drill arbor clears it out fine though.