SHOOTING: Michael Diamond was perfect as he took dead aim at a third Olympic men's trap shooting gold medal.

Competing at his sixth Olympics, 40-year-old Diamond squelched any thought that age may have dimmed his skill as he alone hit every target in the opening three rounds, contested in trying conditions.

He tops the leaderboard in the blue riband event on 75 points heading into the remaining two rounds and final on Monday - the final day of Olympic shooting - at the Royal Artillery Barracks.

Five shooters - Karsten Bindrich (Germany), Fehaid Aldeehani (Kuwait), Italian Massimo Fabbrizi and Croatian pair Anton Glasnovic and Giovanni Cernogoraz - were one shot back on 74 points.

The weather conditions were challenging for the athletes, who had to endure switches between overcast skies, heavy rain and bright sunshine throughout Sunday's qualifying session.

But it mattered little to Diamond, whose resume includes gold in the men's trap at the Atlanta Games in 1996 and another on home soil in Sydney four years later.

A focussed Diamond declined to speak with reporters after completing his three rounds on Sunday.

The top six shooters after qualifying will shoot off for the medals in the final.

Diamond's Australian teammate, 2004 bronze medallist Adam Vella was five shots outside the top six on 69 points.

Australian-born shooter Glenn Kable, who is representing Fiji at his third Olympics, was also on 69 points.

Diamond's performance has given the Australian shooting team a much-needed boost after the lack of success so far on the range.

Should he make the final, Diamond would be just the second Australian to shoot for a medal at the London Games after Suzy Balogh finished sixth in the women's trap.

Jordan Chong
AAP