PewPewPew
Newly Enlightened
If you ever have a stuck bullet or obstruction in the bore of a rifle with no way of clearing it, you can drill/tap the muzzle end with the same threads as a zirc grease fitting. Thread in the fitting and connect a grease gun to it and the hydraulic pressure will remove your barrel obstruction. I had a barrel brought to me with not only a stuck bullet, but also broken hardwood dowels that were wedged into the barrel when they tried to pound it out. You'll lose about 1/2" off the barrel when the threaded portion has been cut off and re-crowned.