For me things were not in meters or feet but hours driven. From my home town the nearest stoplight was 1.5 hours away by car. This is also the closest chain restaurant (like McDonald’s or simular). We had a school bus, but other than that no public transit. The next town over (15 minutes) has a supermarket.
I see where you are going, but you probably should focus less on the guns. Most Americans don’t regularly shoot guns, even those that have them. A whole lot also don’t own any. But lead is all over in shit like water pipes. Other heavy metals and chemicals are present in higher levels than allowed elsewhere. Also full metal jacket is much more common than it used to be which reduces the lead particles when shooting.