If it is factory rounds, I would go with ammo cans too. I would do the same for long term storage. I do however love the MTM cases for my reloads. The 100 round boxes with the hinges are the best. I would also recommend the opaque or clear boxes so you can determine if they are empty or full. I have tried several different containers and I feel the MTM cases are superior.
As you can see below, I use them exclusively for my reloads. It makes it easy to keep up with round counts. I used a color for each caliber until I ran out of colors. Shop around because there is a big difference in prices amoung the retail stores.
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Nice stash!