The barrel was not shortened. As the touch hole was not lined, and was at the rear end of the gouge in the old breech plug. I extended the breech threads to 5/8 deep and drilled and taped the old touch hole for a 8-32 bolt. Shortened the bolt so it would end at the minor diameter of the breech threads. Ran the bolt in with lock tight red. Let every thing set up over night. Then I ran the breech plug tap in and threaded over the inside end of the bolt, effectively making it part barrel. This makes the plugged hole every bit of 5/16 or more, behind the face of the new breech plug. Then my liner was installed in front of the breech face. All this was done as the owner/customer was adamant about retaining all the barrel length. Plus the rear sight dovetail was already cut by the other guy and was pretty close to the practical rearward limit for middle aged eyesight. BJH