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.
300WM_300_Winchester_Magnum_AP_5rnd_Ammo_Belt.dat
GUID deb174cc9749442c94d82f341df96185
Type Magazine
Rarity Epic
ID 36630
Size_X 1
Size_Y 1
Size_Z 0.15
Amount 5
Count_Min 2
Count_Max 5
Equipable_Movement_Speed_Multiplier 1
Aim_Duration_Multiplier 1
Speed 1
Calibers 1
Caliber_0 35239
Tracer 48
Blueprints 5
Blueprint_0_Type Ammo
Blueprint_0_Supplies 1
Blueprint_0_Supply_0_ID 119
Blueprint_0_Build 30
Blueprint_1_Type Ammo
Blueprint_1_Supplies 1
Blueprint_1_Supply_0_ID 36625
Blueprint_1_Build 30
Blueprint_2_Type Ammo
Blueprint_2_Supplies 1
Blueprint_2_Supply_0_ID 36630
Blueprint_2_Build 30
Blueprint_3_Type Ammo
Blueprint_3_Supplies 1
Blueprint_3_Supply_0_ID 36634
Blueprint_3_Build 30
Blueprint_4_Type Ammo
Blueprint_4_Supplies 1
Blueprint_4_Supply_0_ID 36635
Blueprint_4_Build 30
Use_Auto_Icon_Measurements False