I've been playing with reduced powder rifle loads, mostly with cast bullets for a number of years. I use pistol powders as well as reduced loads of rifle powder. I stumbled on a great site for some info on various calibers, check it out and see if you find it as interesting as I do.
http://www.gmdr.com/lever/lowveldata.htm
http://www.gmdr.com/lever/lowveldata.htm