A friend of mine found this barrel in amongst some stuff of his great uncle's, who was a big black powder shooter many years ago. This man passed away between 35 and 40 years ago, so the barrel is at least that old. It was in the original box from Numrich and shows an insurance value of $54. It is marked Hopkins & Allen, in addition to the Numrich name and address. My friend THINKS the barrel is 44 caliber (or very near that). Does any one have any idea what this barrel is for? Many thanks