Tonk. What you should do now is find a .357 Sig barrel for the 239, it will swap out with the .40 and using the .40 mag you have a choice between the two.
The .357 Sig is a souped-up 9mm but I am told by friends on the Texas Department of Public Safety that it is a 100 yard handgun, haven't tried it myself, but have managed to shoot some fairly tight groups at 50 yards with mine.