I wanted a box to hold my 44-77 cases with the bullet up. I took an MTM R-100 box and pulled the plastic insert out and then cut 4 square blocks that just fit into each of the quadrants inside the box. I then drilled each block with an 11-16 forstner bit. Each block will hold 16 rounds bullet up. That was the easiest solution I could come up with short of having a custom box built.
Sam