The real problem is 500 here, 1000 there? Is that industrial plastic a good choice??? Maybe you should go metal for organization and access.
I switched to metal shelves awhile ago. Honestly I am concerned at this point if my basement concrete slab can support the weight.
Just kidding, other than 22lr I doubt I have more than 2k rounds of any given caliber. I am also hoping to correct that this BF.