Hello Dave - Welcome to the ALR site.
I will take a stab at your question, others may have more information. At the home page for ALR you will see a link titled "GUNBUILDING." in there are some pretty basic information - try this link:
http://www.americanlongrifles.org/WorkShop_frame.htmIn the Tutorials area you can find a lot of gun building information on specific tasks. There is also the search function (tab) at the top of each page. Searches should be kept simple as in "Lancaster" or "aqua fortis" and the like. You have to know what you are after and reduce it to one or two words.
Last, and certainly not least: Just ask, post a question to the gun building forum or which ever forum seems appropriate. ALR has some of the most accomplished builders working today (not including me), who are generous with their information on any aspect of building a muzzleloader.
Good luck on your coming build - show us your Chambers build if you feel like it.
dave (yep, another one...)
And oh... a wonderful resource will be found in the ALR Library and museum area - loads of pictures and descriptions of longrifles and pistols of the past.