Adds special 20mm ammo

code/_core/datum/damagetype/ranged/bullet/sniper_20.dm

@@ -16,3 +16,25 @@
 /damagetype/ranged/bullet/sniper_20/du
 	damage_mod = DU_MUL
 	penetration_mod = DU_MUL
+
+/damagetype/ranged/bullet/sniper_20/hei
+	attack_damage_base = list(
+		PIERCE = 350,
+		BLUNT = 150,
+		BOMB = 350, //it explodes inside of you
+		HEAT = 150
+	)
+	attack_damage_penetration = list(
+		PIERCE = 200,
+		BLUNT = 200,
+		BOMB = 50,
+		HEAT = 10,
+	)
+/damagetype/ranged/bullet/sniper_20/hei/sap
+	damage_mod = ARMOR_DAM_MUL
+	attack_damage_penetration = list(
+		PIERCE = 200,
+		BLUNT = 200,
+		BOMB = 100,
+		HEAT = 100,
+	)

code/_core/obj/item/bullet/sniper_20.dm

@@ -30,5 +30,23 @@
 
 /obj/item/bullet_cartridge/sniper_20/du
 	name = "\improper DU 20x117mm sniper round"
+	desc_extended = "For guns that require 20x117mm ammo. This one has a depleted uranium tip."
 	rarity = RARITY_RARE
-	damage_type_bullet = /damagetype/ranged/bullet/sniper_20/du
+	damage_type_bullet = /damagetype/ranged/bullet/sniper_20/du
+
+/obj/item/bullet_cartridge/sniper_20/hei
+	name = "\improper HEI 20x117mm sniper round"
+	desc = "For when you absolutely, positively, without a doubt want something to die."
+	desc_extended = "For guns that require 20x117mm ammo. This one is packed with explosives and an incendiary mixture. Its payload makes cycling unreliable, however."
+	icon = 'icons/obj/item/bullet/20mm_hei.dmi'
+	rarity = RARITY_RARE
+	damage_type_bullet = /damagetype/ranged/bullet/sniper_20/hei
+	jam_chance = 100
+	penetrations = 0
+	value = 10
+
+/obj/item/bullet_cartridge/sniper_20/hei/sap
+	name = "\improper SAPHEI 20x117mm sniper round"
+	desc_extended = "For guns that require 20x117mm ammo. This one is packed with explosives, an incendiary mixture and a tungsten penetrator. Its payload makes cycling unreliable, however."
+	icon = 'icons/obj/item/bullet/20mm_saphei.dmi'
+	damage_type_bullet = /damagetype/ranged/bullet/sniper_20/hei/sap

code/_core/obj/item/magazine/sniper_20mm.dm

@@ -28,9 +28,24 @@
 	value = 40
 
 /obj/item/magazine/sniper_20mm/du
+	name = "20x117mm DU sniper magazine"
 	ammo = /obj/item/bullet_cartridge/sniper_20/du
 	icon_state = "20_DU"
-	prem_restock_ammo = /obj/item/bullet_cartridge/sniper_20
+	rarity = RARITY_RARE
+	value = 120
+	value_burgerbux = 1
+
+/obj/item/magazine/sniper_20mm/hei
+	name = "20x117mm HEI sniper magazine"
+	ammo = /obj/item/bullet_cartridge/sniper_20/hei
+	icon_state = "20_HEI"
+	rarity = RARITY_RARE
+	value = 120
+	value_burgerbux = 1
+/obj/item/magazine/sniper_20mm/hei/sap
+	name = "20x117mm SAPHEI sniper magazine"
+	ammo = /obj/item/bullet_cartridge/sniper_20/hei/sap
+	icon_state = "20_SAPHEI"
 	rarity = RARITY_RARE
 	value = 120
 	value_burgerbux = 1