I have been using the replacement scale sent to me by RCBS. It is a big improvement over the one it replaced. I discovered something, though. The weight that is used to set the 1/10 grain increments on the beam will "walk" up the beam. The normal up and down motion of the beam from weighing and dumping charges is sufficient to bump the weight out of its the indention that it is setting in. It will go up and I have found myself loading an extra 1/10 grain. I am continuously moving that weight back into its slot. Now that I am aware of it I can keep an eye on that. I may send the scale back to RCBS, but I really need it right now.
Since I blew up the 41 Mag. Ruger a while back I have been revamping my methods. I now have a dowel rod marked so that I can check the depth to which a given load of powder is in the case. I check every case with that dowel before I seat the bullet. It is not meant to be an exact measure, just another check to avoid a double charge or a missing charge that I did not otherwise observe. Got this idea from another poster on this or some other forum and thought it a good one.
In checking charged cases for my 45 Colt, 9 grains of Unique, I noticed that after the 1st 15 cases I checked, there appeared to be more powder in the cases. I started weighing the charges and found the cases contained 10 grains of powder instead of 9. Sure enough, the scale was set to weight 10 grains. I know I did not bump the scale. How it got from 9 grains on case 15 to 10 grains on case 16 I do not know unless that weight is "walking" also.. I never left the bench. In fact, never left my seat. The scale error occurred early in the charging process after the 1st 15 rounds. That extra grain would not have blown up my Vaquero, but it certainly have been a problem in the right situation.
The moral here is to never let down your guard. I am going to watch this scale very closely going forward for "walking" weights on the beam. I am not yet convinced that the 1 gram weight was walking like the 1/10 grain weight, but if it is, I will find out.