I know that the Dakota Rounds are made from the 404 except the 450.
Whats the diffrence in Balistics

I don't own one, so I looked every where and found RWS has a factory loading of a 401 grn bullet at 2313 fps, for the 404 jeffery

If you handload both, there isn't much diff. The jeffery will get you 400gr @ 2400fps, the Dakota might get to 2500fps. Both ar great rounds, but I went w/ the .404jeffery.