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Mine is 23 so far . And 213 with the new glitch.
My best strategy is going to the power handle, open the door behind it and then go and camp up the stairs (with multiple people). You can go get the perks and go to the Pack-A-Punch machine (with the teleport nearby).
52 wiv 4 people we glitched to round 20 got bored so we all went nd bort rayguns nd had mgs brownings nd wunderwaffes its just mental at tht lvl millions of dogs 6 raygun bullets 2 1 zombie