Hi Thomas, Kimber does not recommend +P ammo. Straight from the owner's manual - "Do not use +P+ ammunition because its pressures could exceed maximums established by the Sporting Arms and Ammunition Manufacturers’ Institute, Inc. of the United States (SAAMI) and result in an unsafe condition that may cause serious injury or property damage."
Stay safe & have a great day!

Hi Thomas and welcome. This model is +P rated. Just increase the frequency of inspection and maintenance since a steady diet of +P ammunition can cause accelerated wear. Cheers and stay safe!