Perfect Dark Zero

-Create a Team Kill Count
Level: Old Town
Size: Small
Weapons: Custom: All Jackels
Points Limit: 5

-Now everything else should be good, what you want to do before you start the game tho is make sure the game is filled with bots.

-Next Set all the bots on your team to Dark Agent

-Next Set all the bots on the opposing team to Secret Agent, Agent is too stupid that they will take forever to get in enemy range of fire.

-Now the final outcome should look like 16 people: You plus 15 bots, even teams.

-Start the game and it should end in 30 seconds max, now all you do is sit back and start the games.



***Edit***
As an edit to the technique, put 6 bots on the enemy team, put the rest on yours.

Put random spawning on.

Game ends in about 10-15 seconds

Thanks to Daft Incarnate for the edit

Start a Team Killcount Game, balanced teams, your bots are Dark Agents, enemy bots are Agents. Choose small map and weapons such as Superdragon, then start a game. Time limit: none, point limit: 10. It will take about 5 seconds to win the match. You must simply press Start at the end of match and then B and Start to start another game.

Easy as can be, but takes lot of time.

By request, I'm posting the settings I'm using since they seem to result in the fastest matches compared to others' results in the solutions and their respective comments.

My rough calculations put this method at somewhere under 8 hours for all 1,000 matches, which is faster than any other mentioned time. I'll try to gather some actual data on my last 450 matches to get a more accurate estimate of the time required.

Yin, the gamer who encouraged me to write this solution, estimates 6.5 hours for 1,000 matches.

These times could vary depending on various factors such as the system that's being used to run the game or whether the game is installed.

Settings
Scenario: Team Killcount
Level: Old Town
Level Variant: Small
Weapons: Custom
- All RCP-90s
Point Limit: 5
Bot Count: 15
Time Limit: Doesn't matter
Points Limit: 5
Advanced Options:
- Spawn Type: Randomspawn

Then press to "create" the match, and use the following bot settings:

8 vs 8 (7 on your team)

For the bots on your team, use
Skill: Dark Agent
Type: Feud

And the for the rest,
Skill: Secret Agent
Type: Vanilla

Then return to your gamertag and press again to begin the match. After the initial setup, you won't have to do any additional menu work as long as you don't turn the game off. You just have to hit after the match ends, and then and to start a new match.

With these setting the matches typically end in anywhere from 2-10 seconds, with most of the matches around 5 seconds or so. It's extremely rare for the match to last longer than 10 seconds.

Start a Team Kill Count
Level: Old Town or Desert
Size: Small
Weapons: Custom: All Pistols
Bot Count: 15
Balance Teams
Bots: Dark Agent
Bots Personality: Feud
Time Limit: 3
Points Limit: 5

Once you have those options press start and change it to Player+8 Dark bots on one team and 7 on the other. Make sure all of the enemy bots are the Vanilla Personality.

Start your match and then 5-10 seconds later press Start, B, and Start again
Lastly you don't need to but it helps - Download the disc to the hard drive to speed up load times between matches.

Personally I liked the map Desert more than Oldtown and haven't played around with any other small maps.

I chose Feud because for me it was cutting down on my times by 20 seconds making each round last on average 7-11 seconds excluding load times.

I feel it doesn't matter if you have them all on Secret Agent or Agent as long as the enemy bots are one or the other. It seemed to matter more if the Dark bots were Feud or not.

The choice of weapons is honestly up to you but the Dark Agents just about headshot anything and they are quicker this way running across the map with Pistols in hand. The bots also seemed to put away their guns when running for their targets so they know what to do. Other good choices would be SMG's Assault Rifles, or the Jackals as they do more damage for quicker kills but they walk slower.

Please comment if you feel I've missed something or wish to give me a negative vote thus allowing me to correct any problems.
Good luck grinding!