THREEDFLYER–The closest thing to a comprehensive list is the one put out by the ECRA. It lists 11,625 calibers and it is nowhere complete. Here is a link:
Click on the ECRA Caliber Data Viewer from the list on the left.
However, let me ask why you want to make a display board. It might be fine for a small selection, maybe a couple of hundred cartridges, of your duplicates to hang on your den wall, but not for an active collection. Personally. I would not do it, but they are your cartridges. I certainly would not put anything worth more than $5.00 on a display board. No matter how you choose to attach them you are most likely going to damage the cartridges. If you try to wire them on, it has been my experience that the wires don’t hold very well, but if you do use wire be sure to use brass wire, not steel. As a means of displaying a collection it is a poor choice as you will either be constantly rearranging it or will have new rounds out of order all the time as your collection grows. A board the size of a highway billboard would not even come close to holding them all, even if you restrict it to just one of each case type with no consideration of headstamps or load types.
In my opinion, in the end, it will turn into a time consuming project with no hope of ever being complete.