Cci +10
Of all the ammo I have tried in mine, CCI SV and mini mags are the most accurate and best performing. Although it may be true that the SV will provide less stress on your fine pistol, nowhere in my manual does it say "do not use high velocity ammo" A call to S&W confirmed that these pistols are completely capable of firing SV and HV 22 ammo. When I have CCI SV, I use it. When I have mini mags, I use those. nothing else I have tried has allowed my pistol to funtion correctly.