Don’t know about that, but when I reload, I put the powder charge in a group of cases, then inspect every one with a flashlight to confirm they’ve all got the same level of powder in them, before seating the bullets.
I did that with a very lightly loaded set of cases with a Lee powder through charger. What isn’t readily apparent is that .5 grains of powder looks remarkably like 2.5 grains of powder in the bottom of a 38 case, apparently because of some flaw in the charger I was using. I’m to the point that I hate reloading because every time I turn around I seem to have another issue just like this.