diff --git a/code/modules/projectiles/boxes_magazines/ammo_boxes.dm b/code/modules/projectiles/boxes_magazines/ammo_boxes.dm
index 8ffa5b51a7a..c41ddb9fa1a 100644
--- a/code/modules/projectiles/boxes_magazines/ammo_boxes.dm
+++ b/code/modules/projectiles/boxes_magazines/ammo_boxes.dm
@@ -4,6 +4,7 @@
 	icon_state = "357"
 	ammo_type = /obj/item/ammo_casing/a357
 	max_ammo = 7
+	caliber = CALIBER_357
 	multiple_sprites = AMMO_BOX_PER_BULLET
 	item_flags = NO_MAT_REDEMPTION
 
@@ -18,6 +19,7 @@
 	icon_state = "38"
 	ammo_type = /obj/item/ammo_casing/c38
 	max_ammo = 6
+	caliber = CALIBER_38
 	multiple_sprites = AMMO_BOX_PER_BULLET
 	custom_materials = list(/datum/material/iron = 20000)
 
@@ -82,6 +84,7 @@
 	icon_state = "762"
 	ammo_type = /obj/item/ammo_casing/a762
 	max_ammo = 5
+	caliber = CALIBER_A762
 	multiple_sprites = AMMO_BOX_PER_BULLET
 
 /obj/item/ammo_box/n762