I have a bunch of cartridges that have pretty limited options whether "factory" or reloading. Those I can think of off hand are:
38/55, 25/35, 32 WSL, 351 WSL, 401 WSL, 45/60, 303 Savage, 22 Savage High Power, 25 Rem, 30 Rem, 32 Rem, 6.5 Arisaka, 7.7 Jap, and probably a couple others I can't think of at the moment. That isn't counting the more common rounds like 30 Carbine, 358 Win, etc that have limited bullet weight options but are produced by several manufacturers.
