Boom Box Customs Store › .357 Ammo Case 50 Round Image 1 of 3 Image 2 of 3 Image 3 of 3 .357 Ammo Case 50 Round $15.00 .357 Ammo Case. 50 Round Capacity. Please specify color/s desired below. Add To Cart Added! .357 Ammo Case. 50 Round Capacity. Please specify color/s desired below.