Jack Keppel, in his last season with the CSU rugby union club, finished on the highest of high notes by kicking the title-winning penalty in Saturday's New Holland Agriculture Cup grand final.

Keppel's kick gave CSU a 30-29 win over defending champions Narromine Gorillas - a victory which will be talked about for a long time to come both within the club and across the Bathurst campus.

Few would have given the students a chance of getting back into the match after slipping behind 29-10 at one stage against the red hot minor premiers.

Keppel and his team never lost the belief that they could stay in touch with the Gorillas and their positive frame of mind was crucial.

The CSU centre was quick to praise his teammates for even getting him into a position to win the game.

"I said to the boys that we should be able to get a couple of shots in and that we need to take anything that we're given because they're such a tough team to break down," he said.

"We eventually got the momentum and we never let go. I've never been part of a team who had so much belief on the day. From two weeks ago, getting beat by nearly 50, to winning this - I'm so proud of everyone.

"I was just lucky enough to kick that goal."

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Prior to finding the match-winning penalty Keppel had also kicked a close range field goal to bring the margin back down to two.

Keppel believes that moment was a dagger for the Gorillas.

"Peter Koen, our coach, said to me at half-time to just hit a field goal at some point because it would help us," he said.

"I think that really broke them. Momentum is hard to come by in a game like that but from that point we really had it. Narromine are an unbelievable team so after the game everyone knew how much this meant to us."

Last year's preliminary final defeat was a tough one for the CSU camp to take and it left them determined to work hard on a path to the decider.

Keppel, heading into his fourth season, was one of the players charged with leading the run to finals.

Fulfilling that task gives the CSU an immeasurable amount of joy.

"It's a win not just for myself and my current teammates but for all those guys I've played with before. There's been a lot of hard work from the coaches who have come before and it's been building to this game," he said.

"It's a huge win for anyone involved in the club. Being a part of it all is unreal."

CSU were on the back foot early in the grand final, much like the major semi-final a fortnight earlier, but Keppel said there was something different about the atmosphere in the university camp.

"There were a few rousing speeches at half-time. We knew that we weren't playing that bad. We'd just let a couple of lucky tries in," he said.

"Everyone was fighting hard and our forwards were unbelievable. Three weeks ago our pack was struggling to win a scrum but we were dominating Narromine. That all came from attitude and belief.

"It was a big 23-man effort and it was one of the best games I've been a part of, and definitely the best comeback I've ever been a part of."