On my hammer Reilly, I doubt this will be an option as the barrels are no more than 28 thou at any point.

However, on another of my guns, thickness is > 50 thou, which would indicate I could have a chance. Forgive the UK terminology, but if the barrels on this gun are currently improved cyclinder (I think US skeet or 0.005), could I feasibly go up to modified/half choke (0.020) or is the improvement limited to a smaller degree? Bonehills post just above this would indicate it is possible.