HCA is very proud to bring you a new option for your muzzle loader builds! The all new 45 caliber, 1:20" twist Carbon muzzle loader barrel. 27" long with a 4" full steel tennon, this blank has enough steel for a 3/4:24 Threaded brake at the end. Weight at 27" long is 3.85 lbs. Contour measurements are as follows: