A man pointed a homemade pistol at police and yelled "one of you is going down" before an officer fatally opened fire with a rifle, a coroner has heard.

Tjay Robert Doeblien, 27, died after being shot in the chest by a police officer outside an Ipswich home, west of Brisbane, in May 2022.

Police had responded to reports of a disturbance and a male chasing a female with a stick, Coroner Terry Ryan heard at the start of an inquest on Wednesday.

Senior Constable John Johnstone testified he fired his service rifle at Mr Doeblien after the man's statements and his pointing a firearm at officers helped him decide there was a deadly threat to police.

"I decided to attempt to stop that imminent threat. I pressed the trigger once, opened fire once and reattained a sight picture," Sen Const John

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