@ bevo, HC is a double edge swored.
You can be killed as quickly as you kill. Trick to HC is not to get killed and it doesn't just take a shot or two. It all depends on what the other player has as a perk or any other special equipment that they might have at the said time. Silenced guns sometimes require 4 shots and range makes a difference too. Also, some of the players out there can aim pretty darn quick and accurate in HC, so not all apples are the same

. HC I view more realistic way of play vs healing your self from taking one on the shoulder and head.
LOL random spray for kills...no way.
Finally finished the Leathel Semtex challange last night and with an added bonus, got the 25 kill payback with Semtex emblem

. Got lucky 3 times sticking the other team with a Semtex and having one of their mates next to them. It was fun sneaking around and catching someone off guard and sticking the Semtex on their backs. Lots of misses though
Now for the dreaded C4 challange...stupid team mates destroying them is driving me nuts! Need to scheme up a new way of using them.
If any one wants to add me to friends list for PS3, please put a note of GTplanet or just GT...hate getting invites from random little kids

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Mainly do HC TDM or Domination though.
BTW: Any one do the stupid Smoke Grenade Challange? Been trying that on Domination to no end with only 3 kills!!! This going to take a life time it seems.