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Hi Jason, No unfortunately the P40 an't handle it and Kahr doesn't recommend firing any +P ammo through their firearms.

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According to Kahr all Kahr pistols are rated for +p ammo from the Kahr FAQ "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 do not recommend steel case, reloads or un-jacketed ammunition. The Kahr pistol is rated to +P."

I wouldn't trust that. Kahr told me before don't use any +P ammo

Check for your self https://www.kahr.com/faq/ I trust whats in writing more than what someone says over the phone will it cause more wear Yes it will just like in any gun

I would contact Kahr to confirm on Thursday morning. TEL: 508-795-3919 (9am - 4:30pm EST)

Jason, since Kahr will ultimately maintain your warranty, I would get the skinny straight from the horse's mouth for piece of mind at Kahr TEL: 508-795-3919 (9am - 4:30pm EST).