You don't want to put all your eggs in one basket. If you have a safe or steel locker that would work. I found a local LGS that had ammo cans for $7 ea. You don't want dirtbags to know all your hiding places! At $1/rd, it's like pots of gold in convent storage box. After you have been broken in to, you don't want to tell too much info.
Remember the battle of Athens, TN!
"Work as if you were to live 100 Years, Pray as if you were to die To-morrow." --Benjamin Franklin
For now I have them in ammo cans in my bedroom closet. But im going to get a job box and lock up my ammo inside of the cans in side of the job box. They weigh almost 200lbs empty and add a few thousand rounds and that thing will weight a hefty ammount.
I keep my handgun ammo in a small cabinet above the gun safe. I keep shotgun ammo in a military ammo box. in the "gun room" I keep my .357 in a concealed safe in the master bedroom suite, and a box of ammo with it. I have a single shot shotgun on the wall in the library, and a box of shells hidden behind some books.