With the new Lefever project in mind, what are the possible negative effects of shooting modern loads in new Lefever barrels on an original Lefever frame, excepting wood of course (wood can be replaced, albeit not cheaply, and possibly with one of the new pre-fitted blanks)?

Or, would it be wiser to just shoot an original Lefever as is, and pony up for a new one (in stages if necessary)?

I'm not aware of how this would apply to any other older gun, but if you can think of an example, have at it.

Imagination is everything. - Einstein