I think everyone recognizes 13 grains of RedDot is a good starting point for any case greater than 7mm per Ed Harris's recommendation. I am playing with a 9 grain RedDot load behind a 170 grain boolit in a Model 1903 and it is grouping well at 100 yards. Very pleasant load to shot. I do not think I have seen where there are issues with reduced loads of fast powders like RedDot but I thought I would run it by the wisdom of the Forum anyway. Does anyone see any potential problems with a light RedDot load?