If you were wondering, 1000 rounds of 8mm Mauser do fit into one Cabela's dry box woth careful packing. However, it is far more weight than the dry box is designed for. If you lift by the handle, the sidesseparate and the whole thing creaks alarmingly. So i'll be buying more ammo cans before I break open the second tin.
Why open the tin? It is really thin walled, not at all suitable for stacking. Plus, the footprint is an odd size, doesn't fit in with the existing Jenga tower of ammo cans and cardboard cases.
I'm thinking 4 .30 cal cans is the way to go rather than 2 .50 cal. They fit perfectly across the smaller can, so no need to put separators between rows.
Turns out that nothing beats steel ammo cans!