Has anyone ever compared the RCBS 165 SIL-GC with their 180 SP-GC cast bullets in the .308 Winchester? I'd like to try both to determine which would be more accurate out to 200 yards. I have to use my reloading components (mainly primers) sparingly, as I don't have many left. I would guess that the 180 SP-GC would be the most accurate, but I thought that I would ask.