diff --git a/code/modules/projectiles/ammunition/_ammunition.dm b/code/modules/projectiles/ammunition/_ammunition.dm
index 96ffbd9355..47fab97af3 100644
--- a/code/modules/projectiles/ammunition/_ammunition.dm
+++ b/code/modules/projectiles/ammunition/_ammunition.dm
@@ -7,6 +7,7 @@
 	slot_flags = SLOT_BELT
 	throwforce = 0
 	w_class = WEIGHT_CLASS_TINY
+	materials = list(MAT_METAL = 500)
 	var/fire_sound = null						//What sound should play when this ammo is fired
 	var/caliber = null							//Which kind of guns it can be loaded into
 	var/projectile_type = null					//The bullet type to create when New() is called
diff --git a/code/modules/projectiles/ammunition/caseless/foam.dm b/code/modules/projectiles/ammunition/caseless/foam.dm
index 0cc4578c32..343d62c283 100644
--- a/code/modules/projectiles/ammunition/caseless/foam.dm
+++ b/code/modules/projectiles/ammunition/caseless/foam.dm
@@ -61,3 +61,4 @@
 	desc = "Whose smart idea was it to use toys as crowd control? Ages 18 and up."
 	projectile_type = /obj/item/projectile/bullet/reusable/foam_dart/riot
 	icon_state = "foamdart_riot"
+	materials = list(MAT_METAL = 1000)
diff --git a/code/modules/projectiles/boxes_magazines/_box_magazine.dm b/code/modules/projectiles/boxes_magazines/_box_magazine.dm
index 979a46c802..83e6d45696 100644
--- a/code/modules/projectiles/boxes_magazines/_box_magazine.dm
+++ b/code/modules/projectiles/boxes_magazines/_box_magazine.dm
@@ -8,7 +8,7 @@
 	item_state = "syringe_kit"
 	lefthand_file = 'icons/mob/inhands/equipment/medical_lefthand.dmi'
 	righthand_file = 'icons/mob/inhands/equipment/medical_righthand.dmi'
-	materials = list(MAT_METAL=30000)
+	materials = list(MAT_METAL = 30000)
 	throwforce = 2
 	w_class = WEIGHT_CLASS_TINY
 	throw_speed = 3
@@ -20,9 +20,19 @@
 	var/caliber
 	var/multiload = 1
 	var/start_empty = 0
+	var/list/bullet_cost
+	var/list/base_cost// override this one as well if you override bullet_cost
 
 /obj/item/ammo_box/Initialize()
 	. = ..()
+	if (!bullet_cost)
+		for (var/material in materials)
+			var/material_amount = materials[material]
+			LAZYSET(base_cost, material, (material_amount * 0.10))
+
+			material_amount *= 0.90 // 10% for the container
+			material_amount /= max_ammo
+			LAZYSET(bullet_cost, material, material_amount)
 	if(!start_empty)
 		for(var/i = 1, i <= max_ammo, i++)
 			stored_ammo += new ammo_type(src)
@@ -108,6 +118,10 @@
 		if(2)
 			icon_state = "[initial(icon_state)]-[stored_ammo.len ? "[max_ammo]" : "0"]"
 	desc = "[initial(desc)] There are [stored_ammo.len] shell\s left!"
+	for (var/material in bullet_cost)
+		var/material_amount = bullet_cost[material]
+		material_amount = (material_amount*stored_ammo.len) + base_cost[material]
+		materials[material] = material_amount
 
 //Behavior for magazines
 /obj/item/ammo_box/magazine/proc/ammo_count()
diff --git a/code/modules/projectiles/boxes_magazines/ammo_boxes.dm b/code/modules/projectiles/boxes_magazines/ammo_boxes.dm
index 73f8379baf..44bc721d59 100644
--- a/code/modules/projectiles/boxes_magazines/ammo_boxes.dm
+++ b/code/modules/projectiles/boxes_magazines/ammo_boxes.dm
@@ -13,6 +13,7 @@
 	ammo_type = /obj/item/ammo_casing/c38
 	max_ammo = 6
 	multiple_sprites = 1
+	materials = list(MAT_METAL = 20000)
 
 /obj/item/ammo_box/c9mm
 	name = "ammo box (9mm)"
diff --git a/code/modules/research/designs/autolathe_designs.dm b/code/modules/research/designs/autolathe_designs.dm
index b50c6df473..d1bcb952aa 100644
--- a/code/modules/research/designs/autolathe_designs.dm
+++ b/code/modules/research/designs/autolathe_designs.dm
@@ -451,7 +451,7 @@
 	name = "Speed Loader (.38)"
 	id = "c38"
 	build_type = AUTOLATHE
-	materials = list(MAT_METAL = 30000)
+	materials = list(MAT_METAL = 20000)
 	build_path = /obj/item/ammo_box/c38
 	category = list("initial", "Security")