Yeah I know, Zombie thread...
But it's an update.
The one problem I had was that with the universal chamber the Redding didn't like light charges of Bullseye. That is to be expected actually as per the instructions. Small charges of Unique were problematic as well, but wasn't really any surprise. Unique is always fun anyway.
Anyway, I finally ordered the Pistol Chamber for it. The results were very nice. It doesn't choke on tiny Bullseye charges anymore and it's easier to hit the right amounts. It throws small charges Unique quite well also. Average spread appears to be less than 1/10th of grain. Quite a nice change.
Lesson learned: Order the appropriate part and things work better.