Assuming the "reamed out" bores just clean up the pitting/rust, the reamed bores should theoretically be stronger. In reality, the thin spots in the barrel determine the overall strength in regard to pressure. On a H&H quality gun, the wall thickness of the untouched gun are consistant and therefore, when reamed, the walls should be consistant as well. Either way, the min wall sets the the overall strength, more or less. I say more or less because there are other variables but they are difficult to quantify or inspect for.