Today I bored a Marlin 32-40 barrel for a new liner. I bought the liner from Nine35.ca. The liner is a TJ liner in 9/16” dia. I ground a pilot on a 9/16” drill bit to fit into the old bore. I mount the barrel in a 4 jaw chuck and drill at slow speed with lots of water based cutting oil. I can only advance about 1/4” before clearing chips and spraying on more lube. It took me about 3 hours to drill this 26” barrel. I degreased inside the hole and the outside of the liner and glued it with slow curing epoxy. Tomorrow the glue will be dry so I can start chambering and crowning the barrel. I have to recut the dovetails on the front of the barrel for the sight and mag tube.
Here is a video
Antique Rifle Restorations by the Gun Doctor 
Rex:
Could you not rig up a cutting fluid nozzle at the front & flush the chips back towards the breech? Mind you, you’d need to have a catch basin & filter for it so you can re-use the fluid.
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I would love to set up an oil pump and filtration system, it would cut the drilling and reaming time greatly. I just haven’t taken the time to set it up yet.
Rex
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