I tried some of BB's .38spl 158gr SWCHP +P out of my SP 101. They claim an honest 1000 fps (muzzle) for that weight in .38 spl and I can believe them! Its a stout round, feeling (in my Ruger) like a medium power .357 round, like the Golden Sabre.
Well, being a sucker for punishment, I decided to try them again, ordering this time their .357 JHP version, in 158 gr. They claim 1475 fps at the muzzle so I think I'm going to shoot this out of my 4" bbl 686+
. I expect this round to be a handful but controllable in a full size .357 like the Smith.
Anybody else carry this brand of ammo for SD? Its pricey, but it seems to deliver and after a couple of boxes of familiarizing yourself with it you seem pretty good to go in a revolver. What I also recall is that its pretty low flash stuff, making a night confrontation a bit more survivable.
Of course that was with their .38 spl ammo - their .357 stuff might be a tad more noticeable.