Finally completed the Bunker Shooting Range Challenge after hours of trying. : r/gtaonline
I managed to complete the bunker shooting range challenges to be able to hold 5 more of every throwable item in game however it was a pain in the ass to get
Gunrunning - GTA 5 Wiki Guide - IGN
Bunker Shooting Range Challenges Discussion - GTA Online - GTAForums
Gunrunning - GTA 5 Wiki Guide - IGN
Gunrunning shooting range is just stressful... - GTA Online - GTAForums