Matt,
With the accumulation of weight variances in the cases and bullets, something as small as 5 gr might be hard to detect. It's not uncommon for brass from the same lots to vary 2-3grs, and bullets maybe 1 or 2gr. The best safeguard for me, has been to visually inspect charged cases before seating the bullet, weighing any questionable charges.
No experience with the particular scale, but have had good luck with an inexpensive one I bought from Cabela's. Don't get rid of the beam scale, I actually use mine more than the electronic.
Savage