Frank,
Here is a good forum website devoted to cast bullet use. There's even a whole section devoted to cast bullets in military rifles. Does your friend live locally? If so, I could give you some cast rifle bullets that he could load for his rifle. that way he could see what he thinks before he invests in the molds, sizer, and all that.
Many powders will work, but the those in the burning rate range of Alliant 2400 seem to work best. 2400 is not position-sensitive, you don't have to mess with any dacron fillers in the case. Many people swear by the classic Harris "The Load" of 13 gr. of Red Dot. 700X gives similar results. Harris has since added that an even better combination is what I use, 2400 in the 16-19 gr. range for military calibers.
I'm attaching my list of reload formulas. You'll note that I used some other powders (such as 3031, 335 or 748) as well for some reduced rifle loads.....that's only because at the time I was working up loads for a particular caliber, I had lots of powder of those types on hand from when I used jacketed bullets, and wanted to figure out ways to use them up. When I get those stocks used up, I'll develop loads in those calibers with 2400. While I found combinations that did work with those powders, I now stick with 2400 when I do all of my cast bullet rifle loading. It works, its consistent, and it takes less powder to get the same results.
http://www.castboolits.gunloads.com/