Yeah I know my topic. The bore diameter is measured across the lands. The way the picture is drawn is incorrect. It shows the blue line cutting the land and the opposing grove at the half mark for each, that is were the error is. If you rotate the blue diameter line counter clock wise or clock wise to were the blue line touches the "corners" of the opposing lands on each side of the bore, that will be the true measurement of 0.5000 for the bore diameter in the example shown, from corner to corner. The lands are the constant for the bore diameter from land to land across the bore. The grooves' depth are the variable which doesn't change the bore size. If you cut the lands THAT would change the bore diameter. The deeper grooves allow for more bite into the patch/more patch filling the groove (the patch holds the ball) as it travels down the barrel. The shallower grooves can allow for the patch to slip over them which can cause some inaccuracy depending upon there depth and how much slippage occurs. Rate of twist can also influence how much slippage may occur with the shallower grooves. The faster the twist, with the shallower groove, the more potential of the patch slipping over them. So back to my question having said all of this. When I was saying having the rifling cut deeper I was referring to the grooves, the rate of twist will stay the same. I have had one yes from Ohio Ramrod that it did improve the accuracy.for him. DANNY
