arm yourself with a smg, like the viper x-72, and flash grenades. throw a grenade and start mowing the guys down with the viper. don't stop shooting as you move from one to the other or you won't get credit. you'll also want a large magazine so you can keep shooting until you've killed the three.
UPDATE: I was thinking about the "3 kill with a single burst of fire" challenge. Try it with a high powered sniper rifle or frag grenades.
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UPDATE: I was thinking about the "3 kill with a single burst of fire" challenge. Try it with a high powered sniper rifle or frag grenades.