The achievement comes exactly a year to the round - and the opponent - after he played his 250th game.
It also continues a prolific year of milestone achievements for the evergreen midfielder, having broken Port Adelaide's AFL games record in Round 12 last season.
Players who participate in 300 League-sanctioned games qualify for AFL Life Membership.
Cornes's 272 premiership season games as of this Saturday's match against the Eagles at Patersons Stadium will combine with his 26 pre-season matches and appearance in the Hall of Fame All-Stars match (listed as a State of Origin match) to warrant life membership.
Among those games is Cornes's participation in the 2004 premiership side for the Power.
The 10-year anniversary of that achievement was celebrated by the club against Brisbane last Saturday at the Adelaide Oval.
