CoD BO runs smoothly for me on a Core 2 Quad Q6600 and an 8800gts. As others have stated, dual core seems to be at least one common denominator in stuttering issues, but it's really anyone's guess if you'll actually have issues.
Skill in knowing to spam it towards the on rushing, newly spawned enemy? It's the same as everyone else does as soon as they spawn. :p This is nothing but luck.
However, if I was killed in this way I'd probably upload it to Youtube and show it off because lmao! what was a funny kill.