Any moderate load with any style of lead bullet will be fine. The gun is strong enough that you could load hot, but why? See Ken Waters Pet Loads: He developed some loads for the .32 using an OMT. I don't shoot mine, but I have a couple K32's, including a shooter, and I even BUY ammo now and then (sick of reloading). Federal makes or used to make a lead round nose that would be great. Personally, I would never use jacketed bullets in such a gun.