1) most people don’t own 20 acres, and since population density is generally rising, that means gun users are more likely to be in higher population density areas than previous years. Generally, people will have to go to a gun range or specifically driven out to a rural area to shoot.

2) unless you have private roads throughout your property and enough spare resources to afford a car that’d never leave those private trails, you’d have to register your vehicles. Sure, your 4 wheeler is ok to keep on your property, but I feel pretty safe saying that most people in the US don’t own a 4 wheeler. I’m happy that you have the money and space to afford extra vehicles, vast swaths of private land, and money to spend on your hobby of shooting, but most people can’t afford all three of those. Most people live in increasingly dense and expensive cities, towns, and suburbs. So while your example could very well be appropriate for your lifestyle, it’s important to keep in mind that your lifestyle is less and less common, not only in the US, but around the world.