Some of my earliest CF rifles were chambered for cartridges that were considered "obsolete" or "European" and ammo was generally expensive and frequently hard to find if you didn't load your own.

218 Bee, Winchester 43
219 Zipper, Marlin 336SC
25-20, Remington 25
25-35, Winchester 94
250-3000, Savage 99G
7x57, Sporterized FN 24/30