sorry I just saw that it is a 30-06 action.

30-06 is 3.34 COL 416 Dakota is 3.645. I do not know M-70's well enough to know if the action length is great enough you would have to mic' it.

416 Taylor would give you 416 Rigby performance in that action, but would be 500 ftlbs or so short of the Dakota. This may or may not be significant to you.