If you read over the previous pages of topics in the Revolver area I know that its been discussed frequently. For ammo, there's the Factory Ammo area.
There is a Search function on the board. Its at the top of the page under the main header (I hope that made some sort of sense).
There was a thread on 617/817 holsters not too long ago, it was either in the Revolver section or the Carry section. You should be just fine with the Powerball.
Steelheart
Steelheart