Turret bone rotation

Hello, I’ve got a problem with rotating bone of my turret.
Currently my anim blueprint looks like this: Screenshot - 79fc80df48eee947b6a564b3d76c3530 - Gyazo
It doesn’t affect anything, though when I change bone rotation inside skeletal mesh it works. Looks like Transform bone node doesn’t do anything.
Of course I can split turret to two parts and handle it from outside but this is the last thing I want to do.
And, second problem: when rotating bone inside skeletal mesh. Even if I rotate just by 5 degrees, the top part seems to rotate by 45. How is it possible?

edit: Wrong url