Hi Jim,
This site is not dedicated or obligated to encompass the general history of firearms. We don't discuss breechloaders, cartridge guns, revolvers, and many other topics related to firearms development nor are we dedicated to the complete history of percussion arms other than percussion locks were used on later American longrifles. Indeed, by the time percussion was adopted, the technical and artistic development of the longrifle was over. The original mission of this site was to focus on the history, collecting, and building of American longrifles. That mission was expanded to include guns and topics that are linked or relate to long rifles in some way. For example, 18th century English, French, and Germanic guns had direct influences on the designs and decoration of American longrifles. Although longrifles were made until late in the 19th century (until our modern revival), what firearms technology after 1860, domestic or foreign, has any relevance to our mission of studying the history, collecting, and building of American longrifles. The 1860 date I believe was meant to exclude discussions about American Civil War guns. We could rewrite our rule saying any muzzleloading guns but then how do we differ from sites like the "Muzzleloading Forum"? I for one, and I am not alone, would rather not invite a lot of discussions about how to rework your CVA mountain rifles triggers, or how can I make my Traditions Crockett rifle look more authentic. I believe that would drive away many of our most talented, experienced, and knowledgeable members.
dave