0.3mm nozzle printing speeds?

I am currently finetuning my homemade hotend and was wondering what you guys have in the speed settings for 0.3mm nozzles printing ABS?
I started with the aim of reaching 120mm/s but after some hours of finetuning I am currently trying to breach the 200mm/s barrier.
As I am only using a very old Mendel Prusa I am actually quite happy that I got that far.
What speeds are possible with the current printer models? (not the statements on the website, real life)