Thompson Center Encore Pro Hunter 50 Cal Muzzleloader Barrel and Ramrod Blued. I have a used Thompson Center Encore Pro Hunter 50 caliber muzzleloader barrel with the attached forend for sale. This barrel is used, and it’s in good shape. It shows a few signs of use, but looks very good overall. See pictures for condition. This barrel measures about 26 inches long from end to end. It has adjustable rifle sights, with the rear being a peep sight, and comes with the ramrod. Bore is very clean. This is a nice one.