Not paid by anyone to write this. Bought a Sig P322 with hi cap mags. Have a Silencerco Warlock Suppressor attached. Tried Subsonic CCI 720 FPS would not cycle (Very Quiet Though). Had to manually cycle slide to eject each round. Then I put in the Federal .22 Cal Suppressor Ammo @ 970 FPS (RAN FLAWLESSLY!). A little more noise with the 970 FPS of course but nothing much. Didn't check difference with a decibel meter. All depends on your application I would say. Lots of physics involved with each different handgun or rifle. Like I said though, in this particular application lots of fun. Unfortunately, a lot of times it's trial and error to find the correct combination for your particular set up. Kind of like dating.