Advertised at 1130 fps. A fella at the 10mm forums tested them from a Glock 20, and he got 1089 fps. I wrote Federal and asked about the lack of speed, and which barrel they used. As well I asked if the new HST was a new bullet or if it was originally meant for the .40 S&W, and if it would still perform down at 1000 fps from a Glock 29. Here is the reply they sent me. I believe I'm going to start testing these for carry in my Glock 29. Albeit, they will only average 1015-1020 fps from the 3.77" barrel, but I carry mine with a 4.6" barrel. I've never seen an HST that didn't perform well.