I cast and powder coated 609 bullets for 6.8 SPC and and it was a total of 9.6 pounds. I got all of them into the MTM boxes I found and it took two of them. That is about 4.3 pounds per box and these are little 2x2" boxes. These big boxes will store brass and maybe even cartridges, but not bulk bullets.
Also, I might have room for Ammo cans on my garage work bench, but the basement work bench if only 6' long. Plus it has fermenting peppers for hot sauce and no one has room for huge cans like that.
I use food storage containers like the ones sold on QVC called Loc and Loc. The ones I use are from Wegmans. Their clear and the lids securely seal with locking tabs.