On precision rifles and handguns it can make a great difference. That perfect sight alignment does not hold very long. On a shotgun, not so much. Shotguns are moving, rifles and handguns, the less wobble the better. For shotguns, I much prefer four and four and a half or better 3 and a half and 4 pounds. Seven plus on a shotgun I can't deal with. It just never wants to fire. As long as the trigger is under five pounds on a shotgun I would not worry about lock time.