I am in the process of moving to the Brunswick area. Checked into places to shoot and shooting on public owned lands and private property.
I don't know the location of the property where you would like to setup your range. This is what I found out in my location.
In the city of Brunswick you can have a range on your property after obtaining a permit. To my knowledge, there are only two private ranges within city limits.
Brunswick range application:
http://www.brunswickme.org/wp-content/uploads/2012/01/Range-Application.pdf
I spoke with a Brunswick deputy to ask him the legalities and locations to target practice.
He stated that in the city limits you must get the permit. Out in the county, I was to find a place to shoot on public lands, (ie: power lines or public forest) and confirm location with local authorities (county deputies).
Staying with Brunswick, I found the city ordinance pertaining to weapons: (Chapter 17 WEAPONS)
http://library1.municode.com/default-test/home.htm?infobase=12149
However, I could not find any ordinances for Cumberland County. If you have any questions, contact the Sheriff's Office at the following link:
http://www.ccsonc.org/
I hope some of this info is helpful to you.
Please keep us updated on what you find.