Here is the itc rule for ranged d

Weapons
Destroyer Weapons:
For ITC format events, we use the following profile for ranged Destroyer Weapons in place of that found in the book: D Weapons with the Distort Scythe special rule still subtract 1 from the table below.
Roll of a 1: No damage occurs.
Roll of a 2-5: Target model takes D3 wounds, or hull points with a penetrating hit.
Roll of a 6: Target model takes 3 automatic wounds with no saves allowed, or 3 hull points with a penetrating hit with no saves allowed.