If CVs are travelling in a straight path, without adjusting course or someone fiddling it around, I can hit it consecutively. When usually CVs are travelling away or towards the SBs in a bout 30 degrees angle, you give about 0.2~0.3 range difference between each shots. You work your way from there.
I remember landing more than 13 consecutive shots on to the CV. It didn't go down. Finally, before the 15th shot was fired, someone with a 2000lbs load of bomb crashed into the CV, sinking it.