diff --git a/data/json/items/magazine/3006.json b/data/json/items/magazine/3006.json
index 0ddb52d17aaa2..bddc300e74d3b 100644
--- a/data/json/items/magazine/3006.json
+++ b/data/json/items/magazine/3006.json
@@ -1,13 +1,14 @@
 [
   {
     "id": "3006_clip",
+    "//": "Copied from 7.62x54R Clip values.",
     "looks_like": "stanag30",
     "type": "MAGAZINE",
     "name": { "str": ".30-06 5-round clip" },
     "description": "A tiny piece of grooved metal designed to allow a shooter to quickly load five .30-06 rounds into a compatible firearm.",
-    "weight": "40 g",
-    "volume": "10 ml",
-    "longest_side": "9 cm",
+    "weight": "9 g",
+    "volume": "3 ml",
+    "longest_side": "74 mm",
     "price": 500,
     "price_postapoc": 50,
     "material": [ "steel" ],
@@ -19,6 +20,7 @@
   },
   {
     "id": "blrmag",
+    "//": "Previous PR, looks mostly accurate.",
     "looks_like": "stanag30",
     "type": "MAGAZINE",
     "name": { "str": "Browning BLR 4-round magazine" },
@@ -37,6 +39,7 @@
   },
   {
     "id": "garandclip",
+    "//": "Previous PR, looks mostly accurate.",
     "looks_like": "stanag30",
     "type": "MAGAZINE",
     "name": { "str": "M1 Garand 8-round clip" },
@@ -60,9 +63,9 @@
     "type": "MAGAZINE",
     "name": { "str": "BAR 30-round magazine" },
     "description": "An aftermarket magazine for use with the Browning Automatic Rifle, holds 30 rounds.",
-    "weight": "300 g",
-    "volume": "500 ml",
-    "longest_side": "24 cm",
+    "weight": "239 g",
+    "volume": "415 ml",
+    "longest_side": "188 mm",
     "price": 8500,
     "price_postapoc": 250,
     "material": [ "steel" ],
@@ -80,9 +83,9 @@
     "name": { "str": "BAR 20-round magazine" },
     "//": "Compatible magazines made for reproductions exist, and the standard-capacity mags are fairly cheap compared to variants.",
     "description": "A standard capacity magazine for use with the Browning Automatic Rifle, holds 20 rounds.",
-    "weight": "200 g",
-    "volume": "350 ml",
-    "longest_side": "15 cm",
+    "weight": "184 g",
+    "volume": "319 ml",
+    "longest_side": "145 mm",
     "price": 3600,
     "price_postapoc": 100,
     "material": [ "steel" ],
diff --git a/data/json/items/magazine/338lapua.json b/data/json/items/magazine/338lapua.json
index 1222ab9a5d5a2..613502f9eddae 100644
--- a/data/json/items/magazine/338lapua.json
+++ b/data/json/items/magazine/338lapua.json
@@ -1,12 +1,14 @@
 [
   {
     "id": "ai_338mag",
+    "//": "Audited with dimensions/weight from vendor.",
     "looks_like": "stanag30",
     "type": "MAGAZINE",
     "name": { "str": "AI .338 Lapua 5-round magazine" },
     "description": "A single-stack, 5-round steel box magazine, produced by the British precision rifle company, Accuracy International.  Magazines such as this one have been regarded as the gold standard for marksman rifle magazines, with this particular one being compatible with both the .338 Lapua and .300 Winchester Magnum cartridges.",
-    "weight": "78 g",
-    "volume": "250 ml",
+    "weight": "215 g",
+    "volume": "164 ml",
+    "longest_side": "94 mm",
     "price": 10614,
     "price_postapoc": 150,
     "material": [ "steel" ],
@@ -18,12 +20,14 @@
   },
   {
     "id": "ai_338mag_10",
+    "//": "Audited with ImageJ.  Weight from ratio method.",
     "looks_like": "stanag30",
     "type": "MAGAZINE",
     "name": { "str": "AI .338 Lapua 10-round magazine" },
-    "description": "A single-stack, 10-round steel box magazine, produced by the British precision rifle company, Accuracy International.  Magazines such as this one have been regarded as the gold standard for marksman rifle magazines, with this particular one being compatible with both the .338 Lapua and .300 Winchester Magnum cartridges.",
-    "weight": "160 g",
-    "volume": "400 ml",
+    "description": "A double-stack, 10-round steel box magazine, produced by the British precision rifle company, Accuracy International.  Magazines such as this one have been regarded as the gold standard for marksman rifle magazines, with this particular one being compatible with both the .338 Lapua and .300 Winchester Magnum cartridges.",
+    "weight": "298 g",
+    "volume": "233 ml",
+    "longest_side": "95 mm",
     "price": 16856,
     "price_postapoc": 150,
     "material": [ "steel" ],
@@ -35,15 +39,17 @@
   },
   {
     "id": "mrad_338lapua_mag",
+    "//": "Audited with ImageJ.  Weight from vendor.",
     "looks_like": "stanag30",
     "type": "MAGAZINE",
     "name": { "str": "Barrett .338 Lapua 10-round magazine" },
     "description": "A standard 10-round box magazine which can hold up to 10 .338 Lapua rounds, and is compatible with appropriately chambered Barrett rifles.",
-    "weight": "200 g",
-    "volume": "400 ml",
+    "weight": "195 g",
+    "volume": "245 ml",
+    "longest_side": "10 cm",
     "price": 8000,
     "price_postapoc": 250,
-    "material": [ "steel" ],
+    "material": [ "plastic" ],
     "symbol": "#",
     "color": "light_gray",
     "ammo_type": [ "338lapua" ],
diff --git a/data/json/items/magazine/38super.json b/data/json/items/magazine/38super.json
index 7a0d39229ecc1..38af3664718b7 100644
--- a/data/json/items/magazine/38super.json
+++ b/data/json/items/magazine/38super.json
@@ -1,12 +1,14 @@
 [
   {
     "id": "af2011a1mag",
+    "//": "Volume and weight through comparison.",
     "looks_like": "glock17_17",
     "type": "MAGAZINE",
     "name": { "str": "AF2011A1 16-round double magazine" },
     "description": "Two .38 Super 8-round box magazines attached to a single base plate, holding up to 16 rounds in total, used by the AF2011A1 double-barrel pistol.",
-    "weight": "140 g",
-    "volume": "500 ml",
+    "weight": "113 g",
+    "volume": "60 ml",
+    "longest_side": "10 cm",
     "price": 10000,
     "price_postapoc": 100,
     "material": [ "plastic", "steel" ],
@@ -18,12 +20,14 @@
   },
   {
     "id": "m1911mag_10rd_38super",
+    "//": "Audited with ImageJ.  Weight from comparison.",
     "looks_like": "glock17_17",
     "type": "MAGAZINE",
     "name": { "str": "M1911 .38 Super 9-round magazine" },
     "description": "A compact, single stack box magazine for an M1911 chambered in .38 Super.",
-    "weight": "80 g",
-    "volume": "250 ml",
+    "weight": "62 g",
+    "volume": "33 ml",
+    "longest_side": "11 cm",
     "price": 3400,
     "price_postapoc": 100,
     "material": [ "steel" ],
diff --git a/data/json/items/magazine/410shot.json b/data/json/items/magazine/410shot.json
index 0657b566d3fc0..3ceb7644ba066 100644
--- a/data/json/items/magazine/410shot.json
+++ b/data/json/items/magazine/410shot.json
@@ -1,12 +1,13 @@
 [
   {
     "id": "saiga410mag_10rd",
+    "//": "Audited with ImageJ.  Weight from comparison.",
     "looks_like": "shotbelt_20",
     "type": "MAGAZINE",
     "name": { "str": "Saiga-410 10-round magazine" },
     "description": "A removable plastic box magazine for the Saiga-410 shotgun.  Holds 10 shells.",
-    "weight": "210 g",
-    "volume": "500 ml",
+    "weight": "178 g",
+    "volume": "407 ml",
     "price": 4500,
     "price_postapoc": 100,
     "material": [ "plastic" ],
@@ -18,12 +19,13 @@
   },
   {
     "id": "saiga410mag_30rd",
+    "//": "Audited with ImageJ.  Weight from comparison.",
     "looks_like": "shotbelt_20",
     "type": "MAGAZINE",
     "name": { "str": "Saiga-410 30-round drum magazine" },
     "description": "A removable plastic drum magazine for the Saiga-410 shotgun.  Holds 30 shells.",
-    "weight": "460 g",
-    "volume": "1 L",
+    "weight": "340 g",
+    "volume": "777 ml",
     "price": 11000,
     "price_postapoc": 500,
     "material": [ "plastic" ],
diff --git a/data/json/items/magazine/460.json b/data/json/items/magazine/460.json
index 413a465dd03e3..24155a9a3380f 100644
--- a/data/json/items/magazine/460.json
+++ b/data/json/items/magazine/460.json
@@ -1,11 +1,13 @@
 [
   {
     "id": "m1911bigmag",
+    "//": "Audited from IRL measurements.",
     "type": "MAGAZINE",
     "name": { "str": "M1911 10-round magazine" },
     "description": "An extended 10-round magazine for use with the M1911 handgun.",
-    "weight": "100 g",
-    "volume": "500 ml",
+    "weight": "79 g",
+    "volume": "74 ml",
+    "longest_side": "155 mm",
     "price": 3720,
     "price_postapoc": 250,
     "material": [ "steel" ],
@@ -17,6 +19,7 @@
   },
   {
     "id": "m1911mag",
+    "//": "Previous PR, looks good.",
     "type": "MAGAZINE",
     "name": { "str": "M1911 7-round magazine" },
     "description": "A military issue 7-round magazine for use with the M1911 handgun.",
diff --git a/data/json/items/magazine/50.json b/data/json/items/magazine/50.json
index 9d9c1aa213243..1d3521df9b4f1 100644
--- a/data/json/items/magazine/50.json
+++ b/data/json/items/magazine/50.json
@@ -12,13 +12,15 @@
   },
   {
     "id": "m107a1mag",
+    "//": "Audited with ImageJ.  Weight from previous PR.",
     "looks_like": "stanag30",
     "type": "MAGAZINE",
     "name": { "str": "Barrett 10-round magazine" },
-    "//": "Fully loaded 10 magazine, presumably loaded with the 114.7 gram M33 Ball cartridge, weighs 1868.801 grams. Source inetres.com",
+    "//2": "Fully loaded 10 magazine, presumably loaded with the 114.7 gram M33 Ball cartridge, weighs 1868.801 grams. Source inetres.com",
     "description": "A standard 10-round box magazine for the Barrett M107A1 anti-materiel rifle.",
     "weight": "727 g",
-    "volume": "500 ml",
+    "volume": "858 ml",
+    "longest_side": "15 cm",
     "price": 10000,
     "price_postapoc": 250,
     "material": [ "steel" ],
@@ -31,12 +33,14 @@
   },
   {
     "id": "as50mag",
+    "//": "Audited with ImageJ.  Weight compared with M107A1.",
     "looks_like": "stanag30",
     "type": "MAGAZINE",
-    "name": { "str": "AS50 10-round magazine" },
-    "description": "A 10-round box magazine for the Accuracy International AS50 anti-materiel rifle.",
-    "weight": "750 g",
-    "volume": "500 ml",
+    "name": { "str": "AS50 5-round magazine" },
+    "description": "A 5-round box magazine for the Accuracy International AS50 anti-materiel rifle.",
+    "weight": "386 g",
+    "volume": "455 ml",
+    "longest_side": "133 mm",
     "price": 12000,
     "price_postapoc": 250,
     "material": [ "steel" ],
@@ -45,16 +49,18 @@
     "ammo_type": [ "50" ],
     "reload_time": 110,
     "flags": [ "MAG_BULKY" ],
-    "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "50": 10 } } ]
+    "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "50": 5 } } ]
   },
   {
     "id": "tac50mag",
+    "//": "No audit, just copied AS-50 magazine.",
     "looks_like": "stanag30",
     "type": "MAGAZINE",
     "name": { "str": "TAC-50 5-round magazine" },
     "description": "A 5-round box magazine for the McMillan TAC-50 anti-materiel rifle.",
-    "weight": "730 g",
-    "volume": "500 ml",
+    "weight": "386 g",
+    "volume": "455 ml",
+    "longest_side": "133 mm",
     "price": 15000,
     "price_postapoc": 250,
     "material": [ "steel" ],
diff --git a/data/json/items/magazine/shot.json b/data/json/items/magazine/shot.json
index 8fb1767ddb1d3..12558360a3300 100644
--- a/data/json/items/magazine/shot.json
+++ b/data/json/items/magazine/shot.json
@@ -1,6 +1,7 @@
 [
   {
     "id": "saiga10mag",
+    "//": "Audited with manufacturer info/ImageJ.  Weight from comparison.",
     "looks_like": "shotbelt_20",
     "type": "MAGAZINE",
     "name": { "str": "10-round assault shotgun magazine" },
@@ -13,8 +14,9 @@
         "description": "A removable plastic magazine for the Saiga-12 shotgun.  Holds 10 rounds."
       }
     ],
-    "weight": "210 g",
-    "volume": "500 ml",
+    "weight": "340 g",
+    "volume": "682 ml",
+    "longest_side": "298 mm",
     "price": 4500,
     "price_postapoc": 100,
     "material": [ "plastic" ],
@@ -26,20 +28,22 @@
   },
   {
     "id": "saiga30mag",
+    "//": "Audited with ImageJ.  Weight from comparison.",
     "looks_like": "shotbelt_20",
     "type": "MAGAZINE",
-    "name": { "str": "30-round assault shotgun magazine" },
-    "description": "A removable plastic 30-round drum magazine, for use with firearms chambered in 12-gauge shotgun shells.",
+    "name": { "str": "20-round assault shotgun magazine" },
+    "description": "A removable plastic 20-round drum magazine, for use with firearms chambered in 12-gauge shotgun shells.",
     "variant_type": "gun",
     "variants": [
       {
         "id": "saiga30mag",
-        "name": { "str": "Saiga-12 30-round drum magazine" },
-        "description": "A removable plastic magazine for the Saiga-12 shotgun.  Holds 30 rounds."
+        "name": { "str": "Saiga-12 20-round drum magazine" },
+        "description": "A removable plastic magazine for the Saiga-12 shotgun.  Holds 20 rounds."
       }
     ],
-    "weight": "460 g",
-    "volume": "1 L",
+    "weight": "1070 g",
+    "volume": "2036 ml",
+    "longest_side": "218 mm",
     "price": 11000,
     "price_postapoc": 500,
     "material": [ "plastic" ],
@@ -48,16 +52,17 @@
     "ammo_type": [ "shot" ],
     "reload_time": 130,
     "flags": [ "MAG_BULKY" ],
-    "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "shot": 30 } } ]
+    "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "shot": 20 } } ]
   },
   {
     "id": "shotbelt_20",
     "//": "Tileset whitelist for shotgun magazines and speedloaders",
+    "//2": "Not sure what this is supposed to represent, audited volume and weight for loose cloth.",
     "type": "MAGAZINE",
     "name": { "str": "20-round shotshell belt" },
     "description": "A non-disintegrating cloth ammo belt which can hold up to 20 shotgun shells.  Notably less reliable than metal ammo belts.",
-    "weight": "200 g",
-    "volume": "500 ml",
+    "weight": "41 g",
+    "volume": "35 ml",
     "price": 1000,
     "price_postapoc": 50,
     "material": [ "cotton" ],
@@ -80,13 +85,14 @@
   },
   {
     "id": "shot_speedloader6",
+    "//": "Audited with ImageJ.  Weight is a guess.",
     "looks_like": "shotbelt_20",
     "type": "MAGAZINE",
     "name": { "str": "shotgun 6-round speedloader" },
     "description": "A plastic tube with a sliding handle that can be used to quickly load 6 rounds into a shotgun's tube in a much shorter period of time than by hand.  It needs to interface with a chute to be used with any speed.",
-    "weight": "410 g",
-    "volume": "650 ml",
-    "longest_side": "50 cm",
+    "weight": "13 g",
+    "volume": "129 ml",
+    "longest_side": "352 mm",
     "price": 3200,
     "price_postapoc": 50,
     "material": [ "plastic" ],
@@ -99,13 +105,14 @@
   },
   {
     "id": "shot_speedloader8",
+    "//": "Audited with ImageJ.  Weight is a guess.",
     "looks_like": "shotbelt_20",
     "type": "MAGAZINE",
     "name": { "str": "shotgun 8-round speedloader" },
     "description": "A plastic tube with a sliding handle that can be used to quickly load 8 rounds into a shotgun's tube in a much shorter period of time than by hand.  It needs to interface with a chute to be used with any speed.",
-    "weight": "440 g",
-    "volume": "800 ml",
-    "longest_side": "65 cm",
+    "weight": "17 g",
+    "volume": "171 ml",
+    "longest_side": "47 cm",
     "price": 3250,
     "price_postapoc": 50,
     "material": [ "plastic" ],
@@ -118,12 +125,14 @@
   },
   {
     "id": "m26_mass_mag_3",
+    "//": "Audited with ImageJ.  Weight from comparison.",
     "type": "MAGAZINE",
     "name": { "str": "M26-MASS 3-round magazine" },
     "description": "A small 3-round box magazine for the M26-MASS underbarrel shotgun.",
     "variant_type": "gun",
-    "weight": "22 g",
-    "volume": "38 ml",
+    "weight": "112 g",
+    "volume": "255 ml",
+    "longest_side": "118 mm",
     "price": 1400,
     "price_postapoc": 100,
     "material": [ "plastic" ],
@@ -135,12 +144,14 @@
   },
   {
     "id": "m26_mass_mag_5",
+    "//": "Audited with ImageJ.  Weight from comparison.",
     "type": "MAGAZINE",
     "name": { "str": "M26-MASS 5-round magazine" },
     "description": "A small 5-round box magazine for the M26-MASS underbarrel shotgun.",
     "variant_type": "gun",
-    "weight": "36 g",
-    "volume": "62 ml",
+    "weight": "150 g",
+    "volume": "342 ml",
+    "longest_side": "158 mm",
     "price": 1700,
     "price_postapoc": 100,
     "material": [ "plastic" ],