Gunnery tree to level 30
http://www.torhead.com/skill-calc#800ZMfcRrd0z.3
Grav round builds 2 stacks of charged barrel per hit (5 max) to increase damage of HiB or reduce activation of AMP.
Sprinkle in Hammer shots and Full auto, save Concussion charge for pesky leapers and don't be first into battle, your channels leave you vulnerable to interrupts from leapers but if left unnoticed for a few seconds you can wreck your targets.
Good opener is your delayed missle (can't recall name) Grave round and HiB, all three will basicly impact at same time and usually leaves a players health low enough to finish off with a full auto.
Next few levels give you some great PvP skills in Rotary Cannon, Cover fire and curtain of Fire which will make full Auto a thing to fear.