There is no "medium" action per se, but Savage has changed the action screw spacing several times. Short actions form 88-97 were build in long actions. IF yours was built in 82 then it is likely a gen one short action.

Savage Long Actions

Same bolt spacing since the beginning in 1958 = 5.062”

Savage Short Actions

1st. Gen Short Actions = 4.522" (1959 to 1987, staggered feed magazine)
From 1988-1997 there were no short actions, they chambered short action calibers in long actions.
2nd Gen Short Actions = 4.275" (1998 to 2007, staggered feed magazine)
3rd Gen Short Actions = 4.400" (2005 and up, center-feed magazine, not in photo)