I've been a backpack hunter my entire life. 10 miles is my limit. I try and avoid horse hunters so I get off trail at least a mile with my spike camp. I solo hunt and 10 miles pushes me to my limits. If you are in on horses further than that, I doubt you will run into any backpack hunters. Although there are exceptions, keep in mind that a guy willing to pack his camp on his back and spend 3 or 4 days hunting the backcountry and being willing to pack his game out on his back, then return for his camp is more likely than not, a quality hunter.