Well when you consider back boring a 30" 12 barrel .010 reduces weight by 2-3 ounces the amount of metal removed from a small bore will be less by about 1/3. So if you reduce both of the barrels by 3-4 ounces total combined and then remove 3-4 ounces of wood from the stock to re-balance does this get you to the weight you are looking for? I can not see much more than 6 or maybe 7 ounces total weight reduction. Some guns just can not be made real light.