I am in the same boat but haven't started to work up loads yet. I will be using 95 BT and hope to work up to about 52-52.5 grains of R26 for around 3300+ fps.
Will also load some 103 ELD-Xs and hope to get those to around 3250 fps but will see. The older Sierra manual has good data and there are some loads on the Accurate reloading site. Some info here:
http://www.angelfire.com/sd/6mmackley/index.html The article by Steve Timms was most useful for me as most are reloading for varmint bullets and Steve's work aka Dog Zapper is very reliable. Keep me updated and I will likewise.