If you're happy with the loads you're currently using, don't go changin'.
Buffalo Bore makes a "reduced flash" 357 Mag load which I bought to try out at a night shoot. It was marginally less bright than my standard 357 Mag Remington Golden Saber loads, but a LOT less bright than my old Super Vel ammo.
But during the daytime, I can't tell one from another, really.
