Swing bowler Andrew McDonald's six-wicket haul completed Victoria's demolition of Western Australia late on day three of their Pura Cup cricket at the WACA Ground.

The red-headed medium-pacer took 6-67 to become Victoria's leading wicket-taker in the Pura Cup competition this summer with 20 scalps after the visitors toiled in boiling conditions on a lifeless pitch.

He was their sixth bowler used and easily their most damaging as the Bushrangers won by an innings and 158 runs.

The victory moved the Bushrangers to a six-point buffer at the top of the Pura Cup table after finishing off one of the WA's biggest defeats on home soil.

Ian Harvey removed tailender Michael Thistle (14) with the fifth-last ball of the day after umpires allowed an extra half hour of play to allow Victoria to claim the result within three days.

After showing some defiance during the day, the home team surrendered in the final session, losing eight wickets and the last five for 41.

Victoria earlier closed its mammoth first innings at 3(dec)-613, the highest Pura Cup/Sheffield Shield score against WA and the fourth-highest total at the WACA.

Fringe WA player Scott Meuleman (106) was again the surprise leader of the local resistance with his first Pura Cup hundred, after scoring 53 of his side's 151 in the first innings.

Meuleman, who had made just 121 runs in his previous 15 first-class outings before the match, brought up his ton by cutting Jon Moss for four.

But acting captain Moss had him caught on the crease late in the day as the Bushrangers stormed to a win.

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