Jan Bowen hasn't given up on Jest Crewsin' but she is thankful for the emergence of the veteran sprinter's stablemate Fireball.

The respected country trainer will start both horses at Rosehill on Saturday but they are at opposite ends of the betting in their respective races.

While Fireball is disputing favouritism in the Gaypak/United Fruit Handicap, Jest Crewsin' a stakes-winning sprinter, is a $101 chance to return to form in the N & A Fruit Distributors Handicap.

The betting is a relevant pointer to where their careers stand at the moment with Fireball close to a city breakthrough and Jest Crewsin', a Carrington Stakes winner in 2011 and placegetter in 2012, trying to recapture past glories.

"Jest Crewsin' hasn't lost it," Bowen said of the horse who has been a stable mainstay for four seasons.

"On his day he's a very good galloper and I want to try to get him up to the five hundred thousand dollar-mark in prize money if I could."

If Jest Crewsin' falls short of Bowen's goal, she is sure Fireball will be a worthy replacement as the best horse in her Muswellbrook stable.

"I'm lucky he's come along at the right time," she said.

Fireball has already banked $150,000 without winning a city-class race but he is a $6 chance in an open market to go one better than his past two placings at Scone and Rosehill.

Bowen figures an increase in distance and Blake Shinn's booking will take Fireball, a horse she says "is better than average", a long way.

"I've got him up to 1350 (metres) so that will suit him and he's got Blake on so you can't get much better," she said.

Fireball's task has been made easier by the scratching of Peron, the Patinack Farm filly who has won five of her six Brisbane starts.

Peron is also an acceptor in the Listed Gai Waterhouse Classic at Ipswich for which she is the early favourite.