No reason to over think it.
Keep it in a cool, dry place inside a quality ammo can, or even just good plastic ammo boxes.
About the only time you'll see corrosion is if it gets wet, is around salt water, or left in leather loops.
^ ^ ^ pretty much it right there ^ ^ ^
I've got all kinds of different ammo reloaded
and factory. It's not corroded.
I have some that I misplaced that I just found
from when I was young that's probably 40-45
years old from when federal used to pack it in
those red plastic belt holders.
As much as anything I think most ammo corrosion
results from people handling cartridges with
their nasty salty hands, then they put them back
in the container and some time later they pull
out a round that's corroded from being handled.
Properly stored ammo doesn't need any spray of
any kind or coating or anything or tumbling.
If some light corrosion occurs, buff it off with
a piece of steel wool
