Per the Kahr FAQ:
As such I would not run +P+ in a Kahr.Q. Which ammunition is recommended for use with Kahr firearms?
A. Kahr Arms does not endorse any particular brand of ammunition. However, not every brand of ammunition produces the same results. Please check the markings on the barrel hood of your firearm to determine the proper caliber. Kahr suggests a visit to a pistol range to test fire different brands of ammunition in the proper caliber. Kahr cautions against the use of reloads. Lead (unjacketed) bullets can cause excessive fouling and extra attention to cleaning the bore is recommended after firing lead bullets. The Kahr pistol is rated to +P.