I chronographed some of this for a Sheriffs Dept. Trainer years ago. My notes show an advertised velocity of 1020 fps (source not noted).
Federal, headstamped FC 87, went (2")941, (3")1047, (4")1064, (6") 1130.
WCC+P+ 87 went (2") 946, (3") 1024, (4") 1072, (6") 1174.
The '88 GUN DIGEST shows...