The Boy Scouts of America has an excellent resource parents and leaders of all levels should be aware of: The Boy Scouts of America National Shooting Sports Manual. This document encompasses all the national rules and regulations for all types of BSA-approved firearms.
Before you print this document, consider the fact that it is regularly updated. Updates are announced here on the national website and automatically incorporated into the manual linked above. Please be sure to write in the "Date Printed" to any printed documents.