I recently received a Revelation Model 120 from my mother and a box of .22 WMR ammo for it. To clarify Its not my first time with the gun, I just own it now.

I'm looking for information of it because I know that W.A.S isn't around anymore, and the gun is chambered in 22LR so shouldn't be able to use 22 WMR. However both parents have told me they've only ever used 22 WMR with it. (Same type my mother uses for her pistol)

And I myself put a box of 22 WMR through it with no issues. And over the last 2 weeks several boxes of 22LR. I haven't had any issues with case tearing and outside of the gun being older than I am I can't see any damage to it beyond normal wear, so you can probably understand my confusion.

Any info would be helpful, thank you

Edit: a word