I recently bought a German P-1(P-38) naturally it is 9mm. I know they are only supposed to fire 115 grain ball non +P cause the frame is alloy & can crack under high pressure. My weapon has the steel insert in the frame for support. If anyone has knowledge or experience on anything besides 115 gr. ball I would like to know. I believe frangible ammo is usually +P. I usually carry a .45 pre 2 kimber but I wouldn't mind carrying my P-1 once in a while. It's reliable!