Tackleberry,
Just finished plugging two holes drilled too far forward on the front receiver ring on a 1903 Springfield, plugged them with two 6/48 screws installed, cut off with a hacksaw, peened and filed smooth and cleaned up with a polishing wheel. Two holes at the correct location were then drilled and tapped just behind the plugged holes. for a Redfield one piece base,
This was necessary due to the recoil shoulder on the base not being correctly lined up when the first two holes were drilled.
The original holes were centered, just not where they should have been lenght wise on the front ring.