Re: lee perfect powder and scale VS. hornaday digital
You need a check weight. RCBS has a set of weights of exact weight that you use to verify you scales. midwayusa.com has them and they cost $30.49 Product # 493-216
It has been my experience, which has been limited, with the Lee powder scale that it is CRAP.
You can take a match bullet like the Sierra 168 gr 30 cal and weigh it. They are very consistent and will not be more than 1 tenth of a grain if that much off 168 grs.