has the Ruger 77 Hawkeye action (not the tang safety design) dimensions changed at all since introduced? I want to put an original short action 77 Hawkeye barreled action into a current 77 Hawkeye Predator stock and want to be sure the action dimensions are the same. thank you.

No.
And I have even installed tang safety actions into MKII stocks. It does need a new floor plate though, and mill out for the tang. I know, not what you asked....

thanks dpcd

If they are both Hawkeye short action Then they are the same.