Granted I've only cracked it for autorifle handcannon sniper and machine gun, and it's a very rough guide that mainly works with higher lvl guns, but I've finally cracked the equation to calculate weapon damage of a given gun with a given attack value shot by a guardian at a given lvl against a mob of a given lvl. Shoot me your weapon stats, guardian lvl and mob lvl and I'll tell you roughly what damage you'll do within a 25% or lower error bracket as this is [b]the rough guide to approximate damage[/b] Edit 1: so for any one thats interested heres the initial damage calculations fruit. just select the weapon type from the drop menu, input the impact value (found on destinydb) the attack value, your lvl and mobs lvl and itll tell you what damage you'll do. still need more data to get some of the numbers more acurate but its a start ;) https://drive.google.com/file/d/0B_FJgcDQ1B8qd2Rub1dKTmJxMDA/view?usp=sharing