I've got one for my Encore with a 12" barrel. I started with cast bullets and have stayed there, with the exception of the 300 gr. XTP/MAG and 300 gr. Speers. I have many cast loads that have worked well. I would guess that if you want a plinking load of sorts that around 8-12 gr. or Unique would work well for your purposes, mine is a 255 gr. cast Keith and 10 gr. of Unique, it's a pussycat. If you want further load data, I'd be more comfortable if you PM'd me. Not that mine's dangerous, but I don't like posting unpublished data, especially for Encores in popular revolver calibers.
Selmer