I’m having the same issue with both of my airguns. Both my bulldog and my Bullboss are shooting a puff of air in my face when firing. I’m sure this is an easy fix, but not sure how. Is it most likely the breech oring gone bad?
on your bull boss, be sure the shroud is showing the QE logo is on the right side. their is a vent hole on the shroud that is facing up and back if it is not in that position.
When I was hunting with my bulldog I would try to save my Nosler because they where so expensive buggured up the seal and same result I would check the breach seal and most likely it's the issue