Slightly off-topic, but I recently killed two of my Nockturnals, so I switched back to my regular Gold Tip nocks... My grouping of three arrows shifted about 3 inches to the left with regular nocks at 30 yards, 3.5 inches at 40... Adjusted and ready to go, just good to find out before you smack broadheads on with different nocks and automatically expect it to be the same out in the field.
Test, test, test!