The problem with a shotgun is proximity. The effective range of most common shotguns (12 or 20 guage) is a lot closer than most people want to be to anything ex

The problem with a shotgun is proximity. The effective range of most common shotguns (12 or 20 guage) is a lot closer than most people want to be to anything explosive that is on a trajectory towards you! Punt guns (https://en.m.wikipedia.org/wiki/Punt_gun https://en.m.wikipedia.org/wiki/Punt_gun) could be an option but the range would still be limited and they aren't exactly portable.