I'm using 240 gr. hollow point. It's the same box of ammunition that I've had for 15+ years and used in the 629-3 and the other 629-6 and they never made that loud crack. More of a loud dull boom. They are all 4" barrels. I'm not sure, but if it doesn't do it in one it shouldn't do it in the other unless there is something else making it do it, if my thinking is right.
I haven't shot revolver a lot so kind of short on knowledge on them.