this is exactly why i lift lighter and more reps or CROSSFIT. haven't strained anything in 5 years since started while my friends are always having back or shoulder problems.
Actually this is really pretty light for me. I was rep'n 455 at one point (10 years ago). You know up until about a year ago I never used a belt or wraps or any of that shit. I started using a belt about a year ago because I figured I was getting older and I should "be more careful". Actually I think the belt is the problem. Wearing a belt keeps you from properly engaging your core muscles to control the load. You just "push" against the belt to stabilize your core. No bueno.
That and the gym was cold because the windows were open and I only did 1 warm-up set. I don't think cold tight muscles helped at all.