Olympic shooter Michael Diamond's chances of competing in the Rio Olympics have suffered a setback after a court refused to hear his firearm offences case before Olympic team selection.

Diamond applied to bring forward the hearing date to try to have the matter finalised before the Olympic committee's July 4 deadline.

Magistrate Caleb Franklin told Newcastle Local Court it would not be in the interests of justice to displace other court cases to expedite Diamond's matter.

The decision could spell the end of the dual Olympic gold medallist's bid to compete at his seventh Games.

The Magistrate however urged the Australian Olympic Committee to consider that Diamond is entitled to the presumption of innocence.

Diamond was charged with drink-driving and firearms offences after an alleged domestic incident with a relative north of Sydney last month.

His case will return to court on July 25.