Here's a beautiful example that is exhibited by Shannon Pritchard at Old South Military Antiques in Virginia. I've always wanted a shotgun for reenacting even though event coordinators frown on them. They would be accurate for artillery even though carbines were manufactured especially for the artillry. i.e. the J.P. Murray Carbine. Check this link. This is an awesome customized GUN with some good tech info.

Keith

http://www.oldsouthantiques.com/osnfsp6.htm