If you work out with sets of 155 using a barbell, what would be the equivalent in dumbbells? I hurt my left shoulder a long time ago and have never been able to do much on bench. It feels as though my shoulder is going to fall off. I did dumbbells tonight for the first time and I felt much better. Was able to do sets with 65 and 70 lb dumbbells. Shoulder feels sore like it got worked but not like the pain I usually get. Does using barbells put more pressure on the shoulders?