With Chains…
Back Squat: 5-5-5-5-5Bench Press: 5-5-5-5-5
Adding chains to the bar on a lift or press gradually increases the load as you move from the bottom of the squat (chains on floor = no load) to the top (top = heaviest, because all chain links are off the floor). What this means, is that your simply maximizing your force output into the ground.