The London Barrelmaker that I have used for the last'Several Years'Has no trouble making and fitting new bbls to Guns(& DB Rifles)Matching the Original weight, or giving the Client weight Forward or weight to the Rear. The Best Barrel Makers who have been building Barrels since their early TeenYears,Know their Trade'I recently had a 12 bore Purdey Hammer-Gun, c 1881,(Keeping 1 pr of the 3 Original pr of Damascus Bbls.)Re-Barreled with 2 New Pr of Steel Barrels, 12b 2.3/4"x32"...20b 2.3/4"x32".Mr Barrel-Maker made a 'Saddle on the 20b tubes, so that the Original Splinter Forend fitted perfectly on both pr of the New Bbls and still fitted the Orig. 30".2.3/4"x 30".I have Re-stocked the gun back to original Purdey Dims, Steel Heel & Toe Protectors,(Re-Engraved to Original pat. by the Young 'Master Barry Lee Hands)Charcoal Blued by the Master"Turnbull"The weight and Balance with the 30" tubes,very nearly matches the balance when the 32"tubes are on the gun. Yes the 2 pair of 32" tubes weigh exactly the same.I Bored & balanced the New Stock so it feels 'Proper"(According to 35 of the 36 People who have"Thrown the Gun to their Shoulder") Thanks for the"Star Rating" Rocketman' Will you be in Reno?? cc/dt