Corpsman
I don't know that I can settle anything for you,but, CVA has been around a long time,both as the Company who had some legal problems and as the present day Company.
You sound like a pretty sensible fellow.Common sense and caution will take you a long way in the Muzzleloading world. If a Gunsmith checks out your gunshow find and says its okay,I wouldn't hesitate to shoot it.However,go on the CVA web sight and research MAX loads for your rifle before you ever attempt to shoot it.Research ,ask questions ,use your common sense.There is a lot of knowledge to be had on this forum.
welcome and hope you enjoy this Sport as much as we all do.