For example, I'm currently loading a 9mm round and I'm using 6.0gr, I wanted to use less powder so I dropped down to the next smaller size, that size yielded a 5.3gr charge. I'm not able to do a 5.7gr that I wanted for the specific bullet that I was using.
Adjustable charge bar! I've found it doesn't work well at small openings (under 4 grains or so) but from 5-20 grains it will give you the adjustability you want.
NRA Master, Highpower Rifle, Across-the-Course
NRA Expert, Highpower Rifle, Mid-Range Prone