The value of ANY gun is based on exact make, model and condition. Without all 3 factors we cannot even make a good guess at values. Sorry-
$150-$275, depending on condition.
600-650 USD depending on condition.
The value of a .45 caliber muzzle loader made by Richland Arms Co. varies with the condition of the gun. On average, this gun retails for about 150 to about 200 dollars.
Value is too difficult to be accurate without seeing the gun. Condition which includes the amount of original finish and original configuration will determine value. Recommend taking it to a gun shop for appraisal.
The value of that gun would be about anywhere from 150 to 200.
Blue Book of Gun Values
Online (Gun Broker, Auction Arms, Guns America), might find some at gun shops, gun shows.
Blue Book of Gun Values, on line auction.
Old gun catalogs and magazines
Your description is of no use. Take it to a gun smith to identify it before a value can be determined.
Blue Book of Gun Values
25-50 USD