BULLDOZER VS SAFEChampion Safe conducts a door strength test against its competition – Stack-On, Browning and Cannon. See who comes out the Champion. CHAMPION GUN SAFES BULLDOZER VS SAFE 2Champion & Superior gun safes compete against Winchester, Browning and Liberty as to who has the strongest door. There is a clear Champion. CHAMPION SAFE VS LIBERTY SAFE TRACTOR PULLA challenge between Champion Safe and Liberty Safe. A dollar-to-dollar comparison on the pull strength of each companies safe doors. At the end, there was a clear Champion.