The magazine, published by James Brown's company I Feel Good, had been expected to debut in the upcoming ABCs due next month for the July-December 2002 period.
However, commerical director Bruce Sandell said there was little point in reporting an ABC for the July-to-December period because it had only increased its frequency in October.
IFG has given little away in terms of how the magazine is performing. It has set Jack fairly modest short-term goals but is more ambitious in the long term.
Sandell said: "Our short-term goals are sales of 40,000 to 50,000 in the longer term, we're aiming for market leadership of the upmarket men's magazine market within two to three years."
Jack is positioned to compete against GQ, Esquire and Arena, all of which are struggling to hold on to readers.
In the last set of ABCs, Esquire was flat with 62,005; GQ lost 2.1% year on year to 116,380; while Emap's Arena posted a figure of 31,418, after it had to be re-audited when Emap was found to have been in breach of bulk sales rules. As a result, Emap has now stopped counting bulks in its ABC figures.
Sandell said Jack would continue its policy of not using on-cover promotions, although he confirmed the magazine is to continue using backing boards, to help the A5-format magazine stand out at the newsstands.
Jack was launched in April 2002 by Loaded founder James Brown. The magazine's success is being watched closely by the men's magazine market to see if it shakes up the sector in the same way that Loaded did when it was launched in 1994.
This week, IFG also announced that it has signed up three new writers to the magazine, which is going up in size by 16 pages from March.
The new signings are former Loaded deputy editor Michael Holden, who joins as associate editor, former Sky journalist Dan Davies, who joins as full-time commissioning editor, and graduate David Whitehouse, who joins as a staff writer.
If you have an opinion on this or any other issue raised on Brand Republic, join the debate in the .