Originally Posted by
ph4570
A wild guess -- maybe at the low setting there is a small enough gap between the adjustment ram and the powder measure body that individual powder kernels jam up between the ram and the body. But with larger charges the gap is big enough for kernels to slide out of interference path.
edit addition -- From your original post, I see that is your suspicion as well.
It would be interesting to know what the gap is between the ram and the drum edge at that low powder setting.
Also, have you tried a non-micrometer type powder adjuster ram?