He described some of the syrahs he tasted as "exceptional" and said they strongly underlined the potential of the variety in the gravels district.
Mr Caillard also applauded the varietal expression of the cabernet blends he tasted and eventually chose to be part of the top 12 Annual Vintage Selection packs which will now be sent out to key wine media and influencers around the world for review.
Mr Russell said the annual selection was important in keeping the Gimblett Gravels names firmly on the palates of international tasters.
He added it had been planned that Mr Caillard would carry out the selection each year as apart from his being strong on Bordeaux reds it meant that by keeping with one palate they achieved consistency from year to year.
At a recent Gimblett Gravels field day gathering members tasted the 2015 selection and were delighted with what had been produced.
They also discussed the 2017 vintage which Mr Russell described as challenging.
"But it could have been a lot worse - they will still be very enjoyable wines."
He added that the 2016 vintage was "looking really good".
Winemakers were getting smarter and the ageing of the vineyards was boosting flavours, he said.
"This selection [2015] is our showcase to the world."
For the first time a small quantity of Annual Vintage Selection sets will be available for purchase, in specially designed wooden cases, in New Zealand.
The 2015 Annual Vintage Selection
BLENDED REDS (Merlot or cabernet dominant)
Babich The Patriarch
Babich Irongate
Mission Estate Reserve Cabernet Merlot
Sacred Hill Brokenstone
Stonecroft Cabernet Sauvignon
Te Awa Single Estate Merlot Cabernet Sauvignon
Villa Maria Reserve Cabernet Sauvignon Merlot
SYRAH
Craggy Range Le Sol
Ka Tahi Rangatira Gimblett Gravels Syrah
Sacred Hill Deerstalkers
Trinity Hill Gimblett Gravels Syrah
Vidal Reserve Syrah