http://contemporarymakers.blogspot.com -- A site by Art and Jan Riser which displays work associated with the longrifle culture. They update the blog on a daily basis and this is a rich resource for the longrifle aficionado.
http://nmlra.org/ -- The website of the National Muzzleloading Rifle Association
http://www.muzzleloadermagazine.com/ -- Muzzleloader magazine website. A great resource for those interested in historical aspects surrounding muzzleloading rifles.
http://www.flintriflesmith.com -- The site of the late Gary Brumfield. Contains a great deal of information pertaining to the art and history of the longrifle.