User blog:Apepa/Dictator/The Surgical/Mach 5 Challenges and Callsigns

These seem to be the hardest challenges in the game - I mean I've done nearly every other challenge at least once (including Droppin' Crates), and the ones I haven't seem pretty straightforward. These though...I don't know how I'll ever do them, considering latency and bullet spread and all the other factors. Has anyone managed to get these, and if so could you recommend a strategy?