Copp shore 524 lambs in a standard eight-hour shift in a shed in the New South Wales Riverina on the weekend.
The previous record was 519, set by Dwayne Black in Western Australia in 2005.
Copp is already a record holder, as one of five shearers who set a five-stand strongwool lambs mark in King Country in the north island of New Zealand in 2015.
Another Kiwi was also recently involved in a shearing record when New Zealand-born Lou Brown shore 497 Merino ewes in a day.
Brown set the new record on a farm near Kojonup, in Western Australia in April.
