Isaak Heathcote, who was 19 at the time, told jurors in the Supreme Court on Wednesday that he was sitting outside games venue Guf.

"I heard five to six loud bangs... it felt like someone had hit me in the leg," he said during evidence-in-chief.

"Like a rock or firecracker... I got a little frustrated."

Mr Heathcote said he then realised he had "excruciating pain" in his leg and was soon whisked off to hospital in an ambulance.

He said he stayed in hospital for about two to three days and had no recollection of his operation.

Earlier, medical administration registrar Dr Zachary Scollard gave evidence for the Crown about Mr Heathcote's admission to the Launceston General Hospital Emergency Department on July 29, 2013.

He said Mr Heathcote arrived at 10.50pm and had surgery to remove a metallic foreign body in the lower part of his right leg.

Dr Scollard said the object was suspected to be a bullet.

The trial of Launceston co-accused Sean Gregory Richardson, 25, and Damien Wesley Marshall, 31, started on Tuesday.

They have pleaded not guilty to two counts of aggravated assault against Robert Williams and Paul Axton, and not guilty to wounding passer-by Mr Heathcote, on July 29, 2013, about 10.15pm.

The Crown has argued the men had a motive to commit the drive-by shooting at the intersection of York and Charles streets, being revenge for Mr Marshall having been shot in the leg previously.

However, defence counsel for both co-accused have denied their clients had any involvement in the shooting.