"gained in making" is correct and usable in written English.
You can use it to describe someone or something having achieved something through their own effort. For example, "She has gained great experience in making cocktails through working in the bar."
More impressive than the numbers, experts say, is the expertise that I.B.M. managers have gained in making the alliances work.
His argument at the time shown in the film was not so much over whether the bomb should be used against Japan but whether the information gained in making it should be shared with the Russians so that a devastating arms race of the sort that actually happened could be avoided.
If the reputation of the dominant partner is solid, there might be more lost than gained in making a change.
An enlightened government with fewer deficit worries might be willing to make up the difference; there would be political gains in making Heathrow less crowded.
There was encouragement for those who believe Trump in office will be a different beast from the candidate who saw gains in making outlandish statements.
Four Christmases is a perfect example of Witherspoon wielding her power too for personal gain, in making a film for her children – albeit one they won't be able to appreciate or fully digest for a few years.
All of the techniques reviewed in this paper have produced gains in making cloud computing more secure.
In addition, "Beijing sees little gain in making large, pre-emptive concessions to satisfy still-vague US demands, especially as this could simply encourage Trump to roll out additional trade actions," said Michael Hirson, an analyst at Eurasia Group.
While engineers have made gains in making machines recognize patterns, cognition remains a daunting challenge.
His creed was short-term gain, piling in, making a quick profit, and then piling out again just as quickly.
Levasseur noted gains have been made in making workplace discrimination laws more inclusive of transgender individuals.
