at The Gun Works which is the largest muzzleloading speciality retail/mailorder store on the west coast. Everything the shooter needs. Custom guns and gun building parts available. Custom barrels made to order: rifle, smooth, and pistol. Catalog available.
I am pretty sure that Rice Barrel Co. will make a Drop in 15/16, I have 3 of them for the 1” TC Hawken & Renegades. You have a 15/16” Barrel (.45 & .50 Hawken’s are 15/16” The .54 Hawken is 1” and ALL Renegades are 1” inch) They are AWESOME Barrels, I shoot 2 of mine to 1,200 Yards (Fast Twist Bullet Barrels)