Very true! And all the more reason for using an optimum powder at 90�100% case fill!
Extreme shot-to-shot variations epitomize inconsistency. The positions of a low-fill charge of powder in the case ([a] near the web, [b] along the bottom of the case, or [c] near the bullet), varying from shot to shot, guarantee extreme shot-to-shot variations. A full or nearly full case is a better assurance of moderate pressure variations.
Also, a slight variation in charge weight is a smaller percentage of a heavier charge. For example, half a tenth of a grain (0.05 grain) variation is a larger percentage of a 35.0-grain charge than it is of a 50.0-grain charge.
