Did a couple CW smooth musket barrels. Had a 48" piece of 3/8" steel rod. Split one end , slid some coarse emory cloth in the slit , enough emory flaps to be a snug fit in the bore. For horse power , chucked up the rig into an old drill motor. Put some penetrating oil down the bore , and couple hours later , shootable bore. The Emory cloth gets changed when the bore is so muddy from rusty penetrating fluid . Just keep at it. I shot that musket the next day , then traded it for another to play with.
