My best round score is on Karkand. Got it about 2 days ago. 371. It was a 64 Inf only server with about 12 of us. My score was about 150 points ahead of the next guys . Got 105 kills and about 160ish teampoints. Apart from my commander who had 350 but that doesnt count.

So i dunno about over 400 but up to 400 is easily done. Well not easily but definitely doable.