i got new way try this out guys first you do the Normal Dup Gltich and than you Disconect from psn right after that go into TDM KILL AND DIE 1 Time back out go again in TDM 1 Kill 1 Death and than disconnect again after Reconnect wait 20 sec into the Online Screen than press after 20 secong play online and go to S&
and KILL some with a weapon and Die you will see it stick into the leaderboard this worked for me 4 times