You've got a rifle developed for one of the early Wildcat cartridges.
The parent cartridge is the .32-20Win, from which the .25-20Win is derived.
And then the .25-20Win was squeezed down to the .218Bee.
Which was trying to catch on, but was put down by the .222Rem.
As you state, the bullet is .224 diameter. If you can find cases, maybe you could fire-form cases with the rifle and then use neck-sizing and bullet-seating dies for a .223Rem (.224 bullet, of course) to load .218Bee cartridges.
Best thing, of course, is to find a 218Bee dieset.
You'll have fun and some interesting experiences just chasing down reloading tools and components.