​Jesse James, 25, of Ocean Grove, pleaded guilty in the Warrnambool Magistrates Court to being a prohibited person in possession of firearms and drug offences.

Magistrate Cynthia Toose adjourned sentencing until July 17, saying James had significant and relevant   prior criminal history and she wanted to consider an in-depth psychological report.

James, who has spent 43 days in custody, was further remanded and there was no application for bail.

Defence counsel Belinda Northey conceded her client was likely to receive a jail term involving a parole period – meaning he would get at least 12 months' imprisonment.

Police officers executed a search warrant at a Warrnambool Ocean Grove address on May 26 and found James' girlfriend Cassandra Robins asleep on a couch.

There was a large amount of drug paraphernalia in the house, indicating heavy drug use and possibly drug dealing.

A sawn-off .22 calibre rifle was found wrapped in a hoodie under the couch where Ms Robins was sleeping.

There was also a variety of prescription medication, three shotgun shells and five rounds of .22 ammunition, a vial of GHB and a driver’s licence, bank card and passport which did not belong to Ms Robins or James.

There was also a set of keys on a coffee table which fitted a Commodore sedan parked out the front of the home.

In the car were men's and women's clothes, an iPad with James' fingerprints on it and a loaded sawn-off single barrel shotgun.

Police were able to trace the Warrnambool owner of the shotgun, who did not realise the firearm had been stolen.

Ms Northey said James had suffered a traumatic and abusive childhood, he was a severe epileptic and had previously made a determined attempt at self-harm which caused significant injuries.

"It's a question of how long," she said in reference to an expected jail sentence.

The solicitor said that when last released from jail earlier this year, James had fallen back into his ice addiction.

Ms Robins, 27, unsuccessfully made another application for bail and was further remanded in custody.

She has also already spent 43 days in jail.

Solicitor Alex McCulloch asked the magistrate for a a sentencing indication, indicating Ms Robins was willing to admit to possession 3.5 grams of ice and a vial of GHB.

Ms Toose said a further jail time would have to be imposed.

She said there were far too many guns in the community and any prohibited person found in possession of a firearm faced serving a very significant time in jail.

During a search of Ms Robins at the Warrnambool police station after the Ocean Grove raid, officers found five deal bags of ice, weighing a total of 3.5 grams, in her bra.

The magistrate noted that Ms Robins had prior court appearances for offences of violence.