Another vote for RL19, and especially in the 150-160gr. class of bullets. The oft-ignored W760 is good too. If you're into pushing max loads and using magnum primers with a ball powder like W760, I would just advise working-up a load in the heat of the summer to make sure it will be safe to shoot during the cooler months - not the other way around. With seasonal temperature swings from the 50 and 60's to well over 100 degrees, maybe that's something only us desert dwellers need to worry about.?.?
