I do not have any personal experience with them but I would think they would be great in a bolt gun.
Lots of bullet choices, no recoil and super quiet.
The only real limiting factor may be effective range but you are gonna be limited there with any sub-sonic. May have to load down a bit to get the lighter bullets to sub levels but IDK.
I think it would be a cool set-up to have and a blast to shoot since you already have the barrel.
