Because I did not have enough bins or space for each caliber to have its own box, I had to improvise.
I put my 40 and 10mm in the same box, 380 with 9mm mak, 44 mag with 44 spl, 454 casull with 45 colt, 357 mag with 38 spl, created a misc pistol box with all my small quantity and rare brass...