I have been using my RCBS powder measure since 1977. Only recently did I choose to purchase the micrometer adjustment screw. Now I’m kicking myself for waiting so long. Any how, I thought that there were two different micrometer screws, with one being for small amounts of powder (pistol target loads) and the other for measuring larger amounts of stick powders (rifle loads). I finally discovered that the difference between the two adjustment screws, is size. I believe one is ½” in diameter, and the other is 11/16” in diameter (the size I required). I am guessing that RCBS changed the diameter sometime since I purchased my powder measure, as I am not aware of two different models being available.
I recall an article written by Greybeard, which I read on the old forum, where he talked about a powder measure which also used a micrometer adjustment screw, and which also allowed the removal of that assembly, to allow the powder to be dumped right back into the container. I believe it was a Hornady powder measure. I do recall his highly recommending this particular measure. You might want to consider this brand since I am not aware of RCBS having such a feature.