Go to Amazon.com and enter the search phrase "wildcat cartridges". There are several books on wildcats available. Or go to
www.reloadbench.com for some ideas.
Some of the carridges you are looking for are widely availble, some are wildcats:
.22 Middlestead
243 Winchester
260 Remington
7mm-08 Remington
308 Winchester
338-08
358 Winchester
etc, etc, etc.