I will second TJ Liners, have used both and TJ's are by far the nicer ones. Nice folks to deal with as well... Last ones I got from them were for a 32-40 project. When I slugged the bore as soon as the slug got into the bore the weight of the the 1/4" brass rod used to drive it thru was enough to push it thru the entire length of the barrel with no additional help. To say these barrels are smooth & consistent is an understatement.

Great product!
WBLDon