Gun type, auto or revolver, has little to do with it, beyond some occasional side flash with a revolver. It depends much more on the load used.
Many ammo makers now produce loads with flash-retardant powders that reduce the flash greatly. Look for one.
I have a ported 3-inch GP .357 that can light up the night, or barely spark, depending on the ammo used. You don't have to drop down to .38s in it.
Denis
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