For factory ammo I usually favor 165 gr bullets. In reloading I have had good results with both 165 and 180 gr JHPs and FMJs over Power Pistol in my .40 caliber CZs. I also use Titegroup to load lower power 170 gr lead SWCs (approx. 760 fps, approx.130 power factor) for IDPA and steel shooting with good results. Note: for the lower power loads I use a 12 lb recoil spring instead of the 18-22 lb ones I choose for full power loads.