A max load of Blue Dot with a 115 fmj should give you what you want.

I have used the 115 gr XTP with a max load of Blue Dot in an MK-760. Seemed much faster than ball ammo. Cycling was a bit faster too.

I have chronoed a 16 inch carbine with WWB at 1220 fps. Some people have reported that load at 1300 fps. The CorBon 115 gr load went 1440 fps from the same carbine.

Look up the VV3N38 load with the 147 gr Hornady XTP. VV lists it at 1200 fps from a 4 inch barrel. Shooters report about 1150 to 1185 fps with this load in a pistol. Will probably be a bit higher in a longer barrel. Been looking for VV3N38 but cant find any.

The Lyman #47 manual lists a 115 Sierra HP max Blue Dot load from a 16 inch barrel at 1421 fps. They also list a 125 gr FMJ at 1336 with Blue Dot. These are close to some 357 Magnum loads from shorter barreled revolvers.