The only Dickson I owned is made in 1893 and was Damascus barreled. It had been rebarreled by the makers. 6 lbs. 3 ozs.
ALL Brit guns are proofed when new. Proof includes stamping barrel bore diameters in some form. It is then determined if barrels are in proof based on amount of variation from the proof bore diameter. There are plenty of Brit guns with barrel wall thickness at 20 thousandths or even less AND THEY ARE STILL IN PROOF.
My Henry Atkin SLE has thin barrels at about 21 thousandths and it is still in proof. In fact, it was proofed with 'thin' barrels. I am sure as hell not planning to cut the barrels off and graft on new tubes.
