I believe the stock Bulldog is an unregulated airgun. It is set up to give you a few shots at high power. You could easily reduce the hammer spring tension reducing velocity and gaining shots but you'd have to try it and see how you like it. If you decrease the hammer spring too much the valve won't open so the velocity will be super low. So then you have to decrease the fill pressure and any gain in shots is reduced. If you can figure out how to restrict the transfer port it would help gain shots without making the velocity swings really high. If you really want a lower fpe airgun with more shots it may be more practical to go to a regulated gun.