In this paper, a shock-wave based three dimensional sniper localization using passive acoustic measurements over an adhoc sensor array is proposed. The proposed method performs reasonably better than the contemporary method in terms of average and median estimation errors. The system also shows considerable robustness to sensor self-location and self-timing errors. Future works include the conjunction of audio signal with visual or thermal clues for better accuracy. Specifically in acoustic methods, muzzle blast signals can be made more useful if their reverberation can be modelled as an impulse response of the surrounding environment.