been a learning experience on this project. Thought about leaving the bore at 31/32", and calling it good. But upon closer inspection, I notice something interesting. The shaft was a chromed hydraulic cylinder shaft, which apparently was cold rolled. Upon drilling out to 31/32" with a long bit, and shaft extension, it was easy see in the bore, spirals all the way down the bore caused by hardened areas from the cold rolling. I couldnt imagine a big drill bit could walk like that for 26", leaving the bore looking like it had screw threads. So next step was a 1" reamer, which cleaned up most of the spiral oversize areas. Then an oversize 1" reamer to take out the rest of the spirals. Last step Im working on now it with an expanding reamer to final size the bore. Next barrel I make will be with hot rolled steel