.5 could make all the difference in the world depending on what you're loading and what powder. Some powders meter better than other powders. A simple thing that I do to help ensure consistency and safety in measuring powders is to weigh 10 sample charges when I open the can for the first time, and record the weights and target weight. Plug it into the Chrony formulas and I have the average deviation from average weight and the extreme spread of weight variation.
I tape this to the can of powder and then when I am using that powder I know what to expect in variations. Obviously, the closer to max the more attention is paid to it.