In a spring piston I would recommend the R7 or HW30 also if you can swing the extra $$. Their Record triggers are the best I've used on a springer and will come closest to duplicating your powder burners. The pneumatics, like the pump up Benjamin and Crosmans, are also good if you don't mind the extra pump or two on the handle. They offer they added benefit of variable power but are slightly louder compared to the sringers.
