Having owned a Little Dandy for over 20 years and having 14 cylinders. I used it and grew to hate it and its set in its box now for over 17 years since I purchased a good “Adjustable” powder measurer.
I agree with Sevens, the original product was so inflexible it lost interest to most reloaders. If you had a favorite load that matched, then it was a good tool, but still not great.
To me it was a very expensive copy of the Lee power measuring spoons, which was easily one of the worst additions to a reloader’s kit,,,, and yes I have one of those too.
In fact I took one of my cylinders and had a machinist cut it out so that I came up with my favorite load for Herco and the 44 special. It took a total of 6 tries with two different cylinders.
What I didn’t like about it was that it still didn’t make reliable loads. When your loading 5 grains of powder and you can’t keep the load accuracy within 5% I am not impressed.
Your idea might be great, and I congratulate you on your accomplishment in contributing to the gun industry.
But I also think you need to describe and explain your product in much more detail. In my case I am not going to add expense to a product that I already DON’T like without a lot more information or proof of concept.
Good luck to you, wish I could say I had a patent.