if you're neuroed or acid sprayed buckshot will never save you, and pulling out your buck shotgun after you get pounced to try to get a pb after waking up is the best use buckshot has now, just to avoid insta losing to runners, even people who followed the pb meta dont use buckshot as a main weapon anymore because qfa m41s perform way better
also, buckshot sucks against any t3s that arent boilers or vet ravs, and even elder vet ravs can tank through 3 pbs