This item is not included in any spawn asset, but it doesn't necessarily mean that it doesn't spawn naturally on any of the maps.
12GEXP.dat
GUID 9b1332a9dca3402eb777a2d07d8219b2
Type Magazine
Rarity Legendary
ID 52263
Pellets 1
Ballistic_Damage_Multiplier 5
Spread 0.15
Recoil_X 1.1
Recoil_Y 1.1
Firerate -6
Size_X 1
Size_Y 1
Size_Z 0.1
Amount 6
Count_Min 2
Count_Max 6
Calibers 1
Caliber_0 51007
Tracer 51000
Blueprints 1
Blueprint_0_Type Ammo
Blueprint_0_Supplies 1
Blueprint_0_Supply_0_ID 52263
Blueprint_0_Build 30
Explosive
Explosion 51008
Range 6
Player_Damage 25
Zombie_Damage 60
Animal_Damage 60
Barricade_Damage 0
Structure_Damage 0
Vehicle_Damage 40
Resource_Damage 50
Object_Damage 75
Delete_Empty