I use support side thumbs crossed, not really any different than with pistols.
I DO choke up on the J frames, at least the Centennials. I like the UM/Spegel shape as well.
"You need a shotgun, man, it's got a good spread.
It's easy to load, doesn't have a lot of working parts...ya ain't gotta be that accurate, the further away you are the more **** you hit."