They then beat Canada's Matt Dunstone in the 1 vs. 2 page playoff game and then defeated Russia's Evgeny Arkhipov to secure the gold medal.
[8] Although they did not win the Scottish junior championship, McMillan Jr. and his team of Grant Hardie, Jay McWilliam and Billy Morton found success on the men's tour during the 2012–13 season.
[9] The following season, the Dumfries rink continued their success with two more semifinal appearances at the Curling Masters Champéry and the Edinburgh International.
After the team missed the playoffs at the 2014 Scottish Men's Curling Championship they disbanded, with McMillan Jr. joining the Tom Brewster rink at lead for the 2014–15 season.
Later on in the season, Team Brewster made two more tour finals at the Dumfries Challenger Series and the Aberdeen International Curling Championship where they lost to Bruce Mouat and David Murdoch respectively.
[21] After the season, McMillan Jr. left the team to join the new Bruce Mouat rink with third Grant Hardie and second Bobby Lammie.
[25] In the new year, the team ran the table to win the 2018 Scottish Men's Curling Championship, defeating the Greg Drummond rink in the final.
[26] They then faced the Kyle Smith Olympic team in a best-of-three playoff to determine who would represent Scotland at the 2018 World Men's Curling Championship.
[28] At the world championship in Las Vegas, Nevada, the team lost just one game in the round robin to Sweden's Niklas Edin.
[29] The team ended the season at the 2018 Players' Championship and 2018 Humpty's Champions Cup Slam events where they reached the quarterfinals and semifinals respectively.
[32] After finishing the round robin with a 7–2 record, the rink beat Italy's Joël Retornaz and Sweden's Niklas Edin in the semifinal and final to claim the gold medal.
[41] The team was set to represent Scotland at the 2020 World Men's Curling Championship on home soil in Glasgow before the event got cancelled due to the COVID-19 pandemic.
[44] For much of the 2020–21 season, there was no tour due to the pandemic, but Team Mouat won a series of domestic challenges put on by the British Curling Association.
In the playoffs, they beat Canada, and RCF (Russia), making it to the final, where they lost to Sweden, skipped by Niklas Edin.
[50] They had another stellar season in 2021–22, starting the year by winning the 2021 Stu Sells Oakville Tankard and then following it up with the 2021 Masters, their fourth Slam title.
In the playoffs, they beat the defending champion John Shuster rink from the United States before losing the gold medal to Sweden, skipped by Niklas Edin.
[59] After a quarterfinal appearance at the 2023 Canadian Open, Team Mouat went undefeated to claim their fourth Scottish men's championship, defeating the James Craik junior rink in the final.
After defeating Retornaz in an extra end, the team shot a 96 percent game in the final to down Canada's Gushue 9–3 and claim the gold medal.
[65] They then beat Switzerland's Schwaller in the semifinals before defeating Sweden's Edin 6–5 in an extra end for their fourth European title.
After having limited success at the previous three Slams, Team Mouat claimed their sixth title with an undefeated run at the 2024 Canadian Open, defeating the Brendan Bottcher rink in the final.
After defeating the United States in the first round, they lost both the semifinal and bronze medal game to Canada and Italy, failing to defend their title and finishing fourth.