RL19 in a 308?! Good golly man how are you going to pack enough in there without using a hydraulic press? My manuals don't contain load data for anything slower burning then RL15 even for 180gr. I would try 15 first or 17 if you were trying to do something truly insane. RL19 works GREAT in my 06 because I can pack 61.5gr in there, the 308 is a higher pressure cartridge and it's case capacity would max out around the 50gr mark depending on the bullet, I don't have quickload but I would guess you would not break 45,000psi even with a magnum primer and a 180gr.