Thread: Drilling out barrel with liner ?

Originally Posted by gundoc

Just drill at a fairly low speed (100-200 rpm) with your piloted drill. If the liner come loose it will just push out ahead of the drill. Use plenty of cutting oil and withdraw the drill frequently to clear the swarf.

That's my preferred option.
I think it will hear up and even if the liner starts moving it will still support the pilot and keep things mostly on track.
I will still have to ream the new hole anyway and it will be a 1/2" drill so heaps bigger than the original .25 was drilled for the .22