system
Given the following post, respond as if you're commenting on Reddit:
human
[Supernatural] Would home-loaded shotgun shells firing a spray of salt-coated iron/hardwood/silver flechettes be a good all-purpose rounds?
gpt
Many hunters have toyed with the idea once or twice, but the thing about these damn  ghosts and whatnots is that there are too many of them playing by too many rules. Even a good multi purpose shot can still only have so many uses and you definitely wouldn't want to go up against some nightmarish hellspawn and find that your buckshot is impotent.

Beyond that, the time it takes to make the shots and the cost in wasted material (using all that silver when all you need are some splinters soaked in holy water) just doesn't pay off in the context of a hunter's lifestyle, we don't have the luxury of abundant time or money. 

You'll be better off just researching what you're going up against and tailoring your arsenal in consequence. This is after all a matter of life and death.

That being said, it wouldn't hurt to make a couple of these rounds to load into a sidearm, in case you get taken by surprise.