Case box, .44 magnum is a miscellaneous item in Fallout: New Vegas.
Case Boxes contain ammunition casings used in the crafting of ammunition. Each box contains 25 .44 magnum casings that can be used to make .44 magnum rounds.
Ammunition casings are used in the crafting of ammunition at reloading benches. Combine (1) case, .44 magnum, (30) lead, (10) powder, pistol, and (1) primer, large pistol to get (1) .44 magnum round.