The 50AE box from Cabelas took a little modification, but it worked out well. I found that the sabots/bullets sat down low enough in the holes that it was hard to pick them up with my fat fingers. Also, there was too much head space so if it got flipped over everything got scrambled up.

I found a sheet of packing foam laying around that was probably ~3/16" thick, and I cut little squares to put down in the bottom of the holes so they would sit up a little higher. I then lined the lid with a couple layers of it to fill the head space. Now I can pick them up easily and when the box is closed everything stays put.