Free: Contests & Raffles.
How exactly do yo know it was hunters.Lots of people like to target shoot.Just asking ,don't get too worked up.
Looking at the picture, it's not much of a pile and likely multiple users. While I try to pick up my hulls, I won't stop a hunt to search them out. Who here finds all of their shells? That little pile hardly warrants the finger shaking admonition.