I loaded with a beam scale for years and besides being slow they have other drawbacks, such as dust and powder flakes in the pivot points which throw the accuracy out the window. I now use 2 RCBS Chargemaster electronic and haven't looked back. These are easily checked and calibrated........I use 4 different bullets which I found to be of exact nominal weight, 50 gns, 90 grns, 165 grns and 250 grns...........I check regularly and the scales don't vary 1/10th of a grain, and it takes about 10 seconds to do when I start loading. I highly recommend these electronic RCBS scales, downside is the cost of course..........
Most people don't know or don't bother to clean the pivot points on beam scales and this is critical to the accuracy. They must always be kept covered as well.........no dust what so ever or there goes your accuracy, they are actually quite a finicky precision piece of equipment that have stringent needs to maintain their accuracy..........I love my Chargemasters...........