It will probably be difficult for you to find a legitimate game that's going to be any fun for you, because very few people play this game anymore, but you can boost it by having at least 4 people and setting up a VIP match on Camp. Set the time limit to max and the kill limit to max, then have everyone join your game. Each person takes a turn killing everyone else. The shooter sits at the top of the road in the middle of the map while everyone else runs to the road and gets picked off.
Make sure everyone gets an even amount of time to snipe. The match is 20 minutes, so if you have a group of 4, each person gets 5 minutes, etc. You will each get anywhere between 45 and 55 kills a game.
Exact game setting for host:
Ranked match: Yes
Match type: VIP.
Map: Camp
Public Slots: 6
Min players to start: (however many are in your group)
Reward limit: 10000
Time limit: 20:00