http://forums.dirtybomb.nexon.net/discussion/21627/movement-speeds
This was hell to find after all this time. Enjoy the read. Definitely read the entire thread, or at least the relevant posts. It goes deeper further on and the OP is some inaccuracies.
Found an issue with your table after further research. one unreal unit didn’t equal 1cm in UE3, which DB is built on. It was made 1cm with UE4.
I found these stats for the unreal unit pre-UE4
15.3 UU per foot and 50.3 UU per meter(roughly)
This would mean that 470 speed in DB is actually something like 20.94474 mph
I could be very very wrong, as this is based on some fairly old information, but UE3 was 2004 tech(originally). And my sources could always be flawed. Pulling this from the tripwire interactive forums and the wiki links they posted.
EDIT: Still look at this a bit. Found this
UE3: 1uu == 2cm on the unrealengine wiki, so it appears to be the official number if SD hasn’t tweaked it.
Then 470 speed would be 21.0272 mph