Jim,
I shoot both smokeless and black in my RB without any problems, just keep the smokeless loads to trapdoor levels and you should be OK. Some of my best groups have been using smokeless, IMR 3031 and RCBS 300 & 405 GC bullets do well. For black I use 2F and the Lyman 457677 which is a tapered bullet of about 480 gr. This allows you to seat it further out of the case and use 68 - 70 gr of 2F, compressed about .25" and a fiber wad. I use SPG or Lee Shaver's moly-lube, both designed for black. Don't use any lube with petroleum products because it will be hard to clean. I've never used duplex loads but many have with success, supposed to cut down on fouling but I don't want to bother with the extra step and the possibility of double charging the smokeless.
Have fun.