I need help identifying a gun that I just purchased at the gun show. It is an Austin & Halleck .45 inline bolt action with satin nickel plated barrel. First half of the barrel is octagonal and the second half all of the way to the muzzle is round. The rifle came with the manual for a .50 cal so I don't know what charge it will take and unfortunately it does not have a model stamped on it anywhere. I am curious about the quality and the value of a rifle like this so any input would be appreciated. Thanks. Unfortunately I cant get a picture up at this time.