I back bored it to rebalance the gun, after estimating the weight reduction with formula I lost. Now the gun weighs 6 pounds 3 ounces and is very well balanced! (I also drilled the stock a bit.)
Mike
Mike, back-boring will reduce weight, move balance rearward, and decrease both unmounted and mounted swing efforts. Drilling the stock will do the same except balance will move forward. Stock and barrels can be weighted (weight added) for the opposite effects. Within reason, some combination of barrel and stock weighting or weight removal will give a combination of weight, balance, unmounted swing effort and mounted swing effort that suits the shooter. Note that each shooter's preference for a certain combination of handling dimensions is just as personal as is his/her preference for a certain set of stock dimensions.