Hunt was assured from the outset against a Victorian attack featuring Ashes quick James Pattinson to guide the West End Redbacks to 2/102 at stumps on the second day.
The right-hander brought up his first 50 in style, with an array of drives and sweep shots helping him finish the day unbeaten on 62.
Earlier, Pattinson had dismissed opening batsman Jake Weatherald for 0 on the first ball of South Australia's innings when he was caught edging behind.
A riposte between Hunt and Redbacks captain Travis Head (27*) saw them reach stumps with a 79-run partnership intact.
Victoria declared at 6/616 before tea on what has proven to be a docile Junction Oval wicket, still leading SA by 514 runs.