I don't use my scale to weigh items for public sale. It's a mail/freight type scale that I bought when I was doing a lot of shipping at my work. I started using it a long time ago because there were a couple places around here that were really crooks and were ripping people off left and right. Thankfully enough people complained and they shut then down. Frankly it shouldn't matter what you weigh the material on. I used regular bathroom scales for a long time and they were close enough to get a basic feeling for what you have in a box or barrel. It's easy enough to check a scale by placing a known amount of weight on the scale an seeing what it reads. That should give good enough results for what I now use it for.
Like I said as long as the weight at their scale is within a reasonable amount I don't usually fuss but 100 lbs is a little much that's 1/3rd of what was in the barrel. For years my weight and theirs were within a couple lbs one way or the other using the same setup. And yes I have checked my scale. I have 5, 5lb stainless steel bars that I use to check the scale it reads dead on 25 lbs every time I check it. I hardly ever add copper to a barrel at more than 25lbs @a time so I figure that should give me a dang good idea to what's in a barrel when it's full.
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