I have two .38 S&W Victory Models, one British marked and the other Australian.
Cylinder throats of both guns are .362" and barrels slug .359". Factory .38 S&W ammunition of all common brands, Winchester, Remington and Fiocchi is loaded with 146-grain bullets which in my revolvers shoot low right. Starline brass is the best. In my guns Accurate 36-187H or 36-190T tumbled in Lee Liquid Alox and loaded as-cast and unsized at .361" diameter in 1:30 tin-lead from Roto Metals give 640 fps and shoot to the sights at 25 yards with 2.5 grains of Bullseye. In top-break Enfields and Webleys don't exceed 2.2 grains of Bullseye for about 600 fps.
The 187H bullet has a long parallel-sized full-diameter nose section above the crimp groove, which must be sized to fit the cylinder throats and so-loaded is the most accurate, but loads are then specific to one gun.
The nose of the 190T is tapered and can be shot as-cast and unsized in most revolvers, including my 1937 Colt, S&W Model 32-1 Terrier and India Model Ruger. Aussie Victory shoots it pretty well too, as you can see on the target below.
Attachment 257490Attachment 257491Attachment 257492
If you don't cast your own bullets the soft-swaged .358" diameter 148-grain HBWC bullets shoot well seated to 1.20" OAL in .38 S&W brass with 2.5 grains of Bullseye or TiteGroup, but will shoot low unless you carefully dress about 0.05" off the top of the front sight. Depending upon your grip and recoil lighter bullets may shoot off a bit for windage, but a gunsmith or anyone skilled in use of a babbit bar can easily turn the barrel a wee bit to correct that. But I would find a load which is accurate in your gun before fooling with the sights!