Gopher,
I shoot Rainier exclusively, After looking in my books and on the web, My favorite .45 load is 4.0gr of bullseye. I use that for the 200gr SWC and 230gr RN both shoot well in my S/S series 80 colt. It took a little bit of experimenting with seating depth with the SWC's 1.250 works the best so far.
Next will be240gr FP .44 mag with H110.
I found my dealer through their webpage
www.rainierballistics.com I just happen to live in Tacoma Wa. not far from where they are made.
Good luck
Cajun