Hoping for information about a rifle

[Florida343]

This rifle was passed down to me from my father and it may go back further in my family. (I was two years old when he passed and never had the chance to learn) I was compiling information about my collection for my sons and I realized I know next to nothing about this rifle. It is a percussion, rifled muzzleloader, with an octagonal barrel. It appears to be ~.40 cal. It has brass furniture and the stock looks to be handmade. There are no makers marks or any identification marks on the rifle. I would love to know the approximate age and if anyone knows of any information about it's origins. Thanks for looking.