What ackley338 is saying is that some beam scales can show a different "weight" when the poise counters are arranged differently, even though the poise "total" is the same. It's true, too. Set it up one way to read 35.0 grains and the needle will center. Change the poise weights in a way that they also total 35.0 grains, and the needle does not center. So how do you know which is the "right" 35 grains?
ANY scale, beam or digital is more than good enough for reloading IF it was designed for reloading. I wouldn't buy one from a non-reloading source like a cheap import tool store.
It's also true that we obsess about exact powder weight MUCH more than we need to. Just because a sophisticated scale can weigh down to an individual powder kernel doesn't mean we NEED to do that. As I often analogize, what some of us do is like measuring firewood down to the 1/64th".
