57 box in cargo + guess these are final now

code/modules/cargo/packs/ammo.dm

@@ -317,6 +317,12 @@
 	contains = list(/obj/item/stock_parts/cell/gun/kalix)
 	cost = 600
 
+/datum/supply_pack/ammo/c57x39mm_boxcrate
+	name = "5.7x39mm Ammo Box Crate"
+	desc = "Contains a fifty-round 5.7x39mm box for PDWs such as the Sidewinder."
+	contains = list(/obj/item/ammo_box/c57x39mm_box)
+	cost = 250
+
 /datum/supply_pack/ammo/c46x30mm_boxcrate
 	name = "4.6x30mm Ammo Box Crate"
 	desc = "Contains a fifty-round 4.6x30mm box for PDWs such as the WT-550."

code/modules/cargo/packs/gun.dm

@@ -58,7 +58,7 @@
 
 /datum/supply_pack/gun/viperrevolver
 	name = "Viper-23 Revolver Crate"
-	desc = "Contains a a civillian variant of the Viper revolver, chambered in .44 Roumain."
+	desc = "Contains a a civillian variant of the Viper revolver, chambered in .357 magnum."
 	cost = 2500
 	contains = list(/obj/item/storage/pistolcase/viper)
 

code/modules/projectiles/boxes_magazines/ammo_boxes.dm

@@ -450,6 +450,14 @@
 /obj/item/ammo_box/a44roum_speedloader/empty
 	start_empty = TRUE
 
+/obj/item/ammo_box/c57x39mm_box
+	name = "ammo box (5.7x39mm)"
+	desc = "A box of standard 5.7x39mm ammo."
+	icon_state = "57x39mmbox"
+	ammo_type = /obj/item/ammo_casing/c57x39mm
+	max_ammo = 50
+
+
 /obj/item/ammo_box/c46x30mm_box
 	name = "ammo box (4.6x30mm)"
 	desc = "A box of standard 4.6x30mm ammo."