My current favorite 308 load is 165 gr Corelokt (or 170 gr round nose Corelokt), 46.5 grs Varget, CCI 250 primers in Lapua brass and has accounted for 4 pigs in the last month. I am shooting them out of a 19.75" Blaser R-93 Tracker barrel, and in several hundred rounds, I have had no problem with powder not burning. Note that I am in Texas where the humidity is higher (75%+/-), and the temperture is in the 40-50's.