Here are some the rules for transporting firearms thru VA from the VSP site:
http://www.vsp.state.va.us/Firearms_Transporting.shtm
There is no duty to inform about firearms in VA vs NC rules during a stop. Some consider it a courtesy to inform the LEO, others believe in saying nothing.
Suggest that one be careful about transporting loaded rifles during hunting season,
§ 15.2-1209.1. This section empowers the governing body of any county to adopt ordinances making it unlawful for any person to carry or have in his possession, for the purpose of hunting, while on any part of a public highway within such county a loaded firearm when such person is not authorized to hunt on the private property on both sides of the highway along which he is standing or walking; and to provide a penalty for violation of such ordinance not to exceed a fine of $100. The provisions of this section shall not apply to persons carrying loaded firearms in moving vehicles or for purposes other than hunting, or to persons acting at the time in defense of persons or property.