As far as your loads are concerned with the Dragoon, I pretty much load both Walker and Dragoon the same. 45gr 3f BP with 8-10gr cornmeal compressed for my idea of a gas check.
That load pretty much fills the Dragoon and leaves some room in the Walker. My wife tells me that she knows when I'm shooting the Dragoon by the echo up and down the canyon walls.
I would advise though if you wear a ring on your shooting hand, take it off before firing, she'll give a little "buck" when you pull the trigger.