This was my best gunnery parse with BiS 198s and 192 MH. APM was nearly 38, DPS around 4.7k. You can check the rotation tab to see what order I used abilities in and the interval between BS/BB for a good idea of your target time for procs.
The main thing to remember for this spec is to prioritize Proccing BS/BB while keeping HiB/RS and DR/HM on cooldown. Be sure to get five stacks of the damage increase on HiB/RS before it comes off cooldown. Use VB/PS on cooldown as well but be sure it doesnt screw your proc of BS/BB.
As far as gearing this was done with 99.99% accuracy (three purple augments), roughly 600 crit rating, one alacrity piece and three surge. Try augmenting more accuracy if you feel you have too many enhancements. Augmenting Aim or Power at this point in the game isn't as good as it used to be.
Your set bonus is really critical for getting high end numbers as you are guaranteed a huge hit on DR/HS as well as a static 2% DPS increase. But if you dont raid that can be an issue.