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You can't line a barrel for a high pressure cartridge using the normal liners, they are too thin. The problem is that no liner can be made to fit perfectly with full support at all points, so the liner has to be thick enough to stand the pressure by itself. The usual liners (as sold by Brownells and others) are made for .22 and older low pressure black powder cartridges like .44-40.
I think Bart is talking about the situation where high pressure is involved, but it is important to retain the original markings, as in a collectors item. As he says, you would have to have a liner specially made (by turning down a standard barrel blank) with sufficient thickness to contain the pressure, and ream out the original barrel to a thin shell. That requires a fair amount of skill, well beyond the usual simple lining job.
Jim
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