Reynolds357, you skipped 36, 43, and 47/48 calibers.
...Not to mention 51, 58, 60, 62, 66, 70, 73, and 78 calibers.
All of the above, plus your list, are available, on the shelf, within six miles of my home.
However...
Just looking at calibers isn't very useful. It would be very difficult to argue, for example, that there is no gap between 7mm Waters and .30-378 Weatherby; or between .22 LR and .243 Win; or between .480 Ruger and .50 BMG.