Definitely subsonic rounds at about 35 yards. Suckers hit hard for the amount of powder behind them, I know that has a lot to do with the bullet shape. I started off with 10.0 grains of Titegroup and backed it down to 9.9 grains after one out of six rounds went supersonic out of my Knights SR-30. I bought these bullets and a bunch of their 9mm 125s, pretty happy with them.
http://leatherheadbullets.com/30-cal...ackout-500-ct/