Sorry bud, but I think an indoor range kind of defeats the point. As a naturalist, I understand that some days the weather just prevents you from doing what you may want to do. But then again, if friends of mine wanted to go shoot, I'd love to take a day trip with a few buddies to your range. Maybe, 120 miles?, 2-hour trip?, --for a day trip once or twice a year, if they're really good buddies, and by the way, there better be some good eats along the way! When I get back to your survey, I'll click around 15 or 20 miles, because that's what I'll drive for a good shop/ equipment supply, which I assume a range will have.
North Carolina
-Drew