The thing with guns and ammunition is that you can use those to get the goose down from people like me.
In less simplistic cases, people will gather and organize and decisions will get made over how resources will be allocated and distributed. The people who stockpile other resources are unlikely to be in a better bargaining position than those with the guns. And it might not require any shooting.
Not that any of this is likely--I just don't think it's limited to Rambo / Scarface types.
Stockpiling goose down will mean that the tribe will decide that the old man gets the goose down. And the doctor.
Might help you answer that.