H110 if you want to be really obnoxious. I've also used IMR4227, but it doesn't have the same effect. I don't recall the charge weights, but you can use hodgdons reloading centre and do your load development.
Frontier 110gr plated bullets are what I use, and Dominion SR primers
Brass... winchester makes it. But for the cost of brass I was just buying American Eagle factory loads ($33-ish) and figured that was a fair deal for obtaining brass.
It's a fun little gun, and great for new shooters to give them the magnum experience without the recoil. It's essentially a .30 magnum pistol, really, and deadly accurate.