"I was aiming for a throw around 17 metres. I was stoked to go almost a metre further," Palmer recalled.
"All the pressure was off because I've got another three years in this age group. I just wanted to enjoy it and kept calm. But having three Aussies there fired me up, you know what Trans Tasman rivalry does for any Kiwi ... it was one of the biggest events I competed in."
This results placed him No 2 in the country on the New Zealand under-20 rankings and No 3 on the Australasia under-20 rankings. He also broke the Hawke's Bay-Gisborne 19 years and under male record of 15.56m which had stood since 1985.
Should his March 17-19 national championships campaign in Hamilton go to plan Palmer, the 2016 Hawke's Bay Secondary Schools Male Athletics Athlete of the Year, should be selected for the July Commonwealth Youth Games in the Bahamas.
"My long-term goal is to try and qualify for the World Junior Champs in Finland next year. The qualifying mark with the 6kg shot is 18.60m so I'm on track with 12 months to do it," Palmer said.
With two days of training with his Christchurch-based coach, former Australian athlete Dale Stevenson, before the one-day comp Palmer returned home knackered. He has had a break from training this week and will resume training on Monday.
"It has been good re-charging my batteries and catching up on school work."
His next meet will be the March 8 East Coast Secondary Schools Champs in Hastings. From March 26-30 Palmer will be in action at the Australia national champs.
Palmer's decision to have a spell this week was just as sensible as ANZ's decision to withdraw from the world under-18 champs.
The Christchurch trip helped Palmer make a key decision related to his long-term future.
When he leaves school he will head to Christchurch to study sports science and coaching.
This will enable him to be closer to Stevenson who also coaches Kiwi Olympian Tom Walsh and Ballantyne.