WATCHMEN

An absolutely amazing spreadsheet by Tibbel and the folks at MMO-mechanics.com. This baby allows you to input your stats, spec, assign variables such as class buffs and completed companion conversations, etc. Then it gives output data regarding your crit chance, damage, etc. THEN you can set a rotation and calculate the resulting dps. Works for each spec and both factions. Outstanding.

Click on the link to Tibbel's Marksmanship Sniper/Gunslinger Compendium, scroll down (or click the link in the table of contents) to section "IV Resources", then click the link in the section "IV.3 The Sniper/Gunslinger Spreadsheet" and download. Instructions are on the first sheet of the document.

http://mmo-mechanics.com/swtor/forums/thread-953.html#IV