I don't have the 475, but I have the 480 Ruger (475 short). I have used cast 370 LBT, 375 LBT GS, 390 LBT, 400 Lee, 400 RCBS semi wadcutter, 400 , and 425 LBT. I have used Lil Gun in this with good results. It is a good high performance powder. 231 and Titegroup and HS7 have been my mid loads. The mid loads are fun to shoot. John Linebaugh told me that he shoots alot of 1000 fps loads in the 45 colt and even hunts with that quite often. The 475 bore at the same speed is devistating.
Hcliff