I'm a big fan of flashy, boomy powders, it makes you take the punishment, instead of the gun. Three of my favorite powders are blue dot, H110, and power pistol.
I bet a light bullet seated over a full charge of blue dot would be louder and flashier than H110 with heavy bullets.
H110 is for heavy bullets, it doesn't make any sense to use it for light bullets, so I haven't tried it.
I loaded a "oops" overload of blue dot in a 357SIG case with 124 grain bullets, and it was louder than anything I've ever heard, short of a full power .454!!!!
I took my CPP class next to somebody shooting a snubby taurus.
That thing was LOUD, man. I mean really loud!!!
And you could see the flash at 2 in the afternoon on a bright sunny day!!!
I asked the instructor (A good friend of mine.) what kind of ammo he was shooting in his .357 magnum....
HE said 'Oh no, I asked him that, too. I told him the ammo was not acceptable for this course, he showed me, he was shooting win white box .38 special, and the gun isn't a magnum, it's a PORTED .38!!!'
Apparently the taurus porting REALLY makes things loud and flashy.