Void rocket launchers are also good for getting several kills at control points. You can judge the number of enemies at a control zone by how quickly the capture meter is filling then blast Truth into their faces for quick points. 
I wouldn't count on heavy ammo, though.
Back when I did it, shotguns were the best way. That was before the first nerf, though. 
Today, I think I'd go with a fusion rifle or Atheon's Epilogue, obviously.
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	I used atheon ep, praedyths rev, and the truth, took longer cause it was on my hunter, only class without void, unfortunately, got it today