Hornady specifically recommends that their swaged bullets be kept around 800 fps, but also specifies their 148gr HBWC at 800 fps as their most accurate .38 Special load.

I've worked up a decent .38 Special load with Hornady's swaged HBWC and am close to a good .357 Magnum target load (IOW under 900 fps) with their 158gr swaged LSWC.

However, some hard cast bullets from Penn are on their way. I'll report here on which is most accurate in my revolvers.