It seems that the 180 Gr bullet was one of the original standard loads for the .40
I found a really good wiki page covering the .40 cal pretty well.
The content of the article indicates loads have been worked up for bullets as light as 125 gr., and up to a 200 gr. bullet.
You shouldn't have any trouble finding good load data for your 180 gr. round.
Here's a link to the WIKI page: .40 S&W - Wikipedia, the free encyclopedia
I wish you well, and hope you find the perfect bullet load for your pistol.