Dented case on ejection

[lizard6.5]

Hey i am new to site but i have had trouble with dented brass went through alot trying to figure out why it was shaving brass and denting the brass i changed the buffer spring to try and slow cycle changed stock buff and spring agian did not change sent it to jt said it was fine and sent me adjustable gas block wrong size so gave up at that point me and a buddy was reloading some brass and tried a littel hotter load and guess what the brass came out with no dents my load was 123 amax hodgdon blc2 powder 31.8 grains cci primer it tighted up my group to 100 yards 3 shots dime size