I just finished testing my three PCC rifles. All three exceed the IDPA 135 pf by at least 10 fps. 9mm - 160 gr 2.8 gr WST.
.40 S&W 180 gr 2.6 gr Solo 1000. .45ACP 2.8 WST 200 gr LSWC. Ran all three across our LabRadar chrono. The .45 is the softest, followed by the .40, with the 9mm bringing up the rear. All three use the Kynshot RB5015HD and the Kynshot buffer weight. The .45 shoots softer than a gas gun. The dot does not move. The .40 is about like a gas gun. The 9mm is a touch harsher. BTW all three use a plain 5.56 carbine recoil spring.