Bary said the horse hadn't been tried over further than a mile to date simply because the races hadn't aligned at the distance at the right stage of his preparation until now.
"There was only the third leg in the spring [Group 1 Livamol Classic, 2040m] and he'd had enough after the first two legs," he said.
"The races haven't really lined up on where we wanted to go. If he gets it [the 2000m], then it opens up a few more doors for us in the spring."
Regular rider Riddell will again partner the 4-year-old son of Atlante, having also had the option to ride Royal Performer, on whom he won the Group 1 Herbie Dyke Stakes (2000m).
"I suppose he has taken the line that Mav has had a pretty good season, he hasn't run worse than third all season and has been racing in Group 1s in four of his six starts," Bary said. "He's a horse on the up. He's only four and still learning what to do."
The gelding is five weeks between runs but Bary has kept him up to the mark with a 1400m trial at Foxton last week, when he finished second under a hold behind Hunta Pence, in addition to trips away to gallop at Waipukurau.
"It's just my style of training. He's been up all season, and if he isn't fit enough now, then he probably never will be. My only concern will be the track and the rain and how much they get. I don't think I'd start him on anything worse than a Slow7. I'm just hoping they don't get much rain. It's the end of summer, so any rain they do get, it should handle it."
Hindsight is a wonderful thing, but given the gelding's consistency, it is hard to fathom Callsign Mav paid $82 when comfortably winning the Tarzino Trophy.
"I don't think he will ever pay 80-1 again, but you do have to remember it is a big step from their 3-year-old season to four," Bary said. "He took the step, thankfully for me and the owners, and away we go."
Saturday's contest will be the last run of the season for Callsign Mav and Bary has been content to keep him to racing left-handed to best suit his conformation.
"It is definitely his last run of the campaign. He has run really well, so he will be in the spelling paddock for a couple of months and then we start it all again.
"He turns out in his right front and it probably turns out a two or three out of five, hence we have kept him racing left-handed. He works reverse way on my track at home, which is tightish, two days a week and gallops no problem. But I think race day pressure, leading on that leg is a different thing and I don't think there has been a need to do it."
Callsign Mav won't be Bary's only runner at Awapuni on Saturday, with stablemates Motivation, Bucky and Ask Pa likely to race. Motivation, who has finished fourth at black-type level on three occasions, will tackle the Listed Bramco Granite & Marble Flying Handicap (1400m).
"He races best fresh up, so we've done that. It was a good trial the other day chasing home Deerfield.
"We aimed specifically for this race, and whether he carries on to Hastings in a couple of weeks, I'm not sure, but we're really trying to crack it here. He's been racing consistently all season against good horses. It would be really nice for Christopher and Susanna Grace [owners and breeders] to get some black-type for him and the whole family.
"Bucky will run in the Rating 74 1200m race, while Ask Pa will probably drop back to a mile in a Rating 65 on Saturday."
