Yes I can make whatever number of cavities one orders in gc and pb. The swithover price is $10 extra.
When you order a 115 gr you get real close to 120 gr in gc, ditto any weight ordered, add about gr for the gc. 120 gr is the best weight for the little Ruger single six. The bullet, when gas checked, will stand far more speed and pressure than the revolver can deal out, so for rifle use one can easily get 2400 fps in most 30 cal guns, and if ordered in .314 diameter will fit a host of rifles of 308 and larger up to that size.
4 cavity molds are $175 each. Go to my website to communicate directly with me. You can get my online catalog and do any questions by email from this site. LBTMoulds.com