I load 2.0 grains of Red Dot under a Hornady 90 grain lead swc bullet.

I use one of Lee's 0.3cc powder scoops for the measure; if I am consistent with my measuring, it consistently measures out 2.0 grains of Red Dot. You could file the top of one (or several) of these cheap plastic scoops to measure various powders for light loads.

I do this, with different sized scoops, for many of my handgun loads in various calibers and powders. I mark the scoops and keep a chart of the various powders with the charges each scoop throws.