If you reload, they are awesome! Don't even need earplugs with the right load. I've never seen a benefit to accuracy on my end. But, there are several studies that show with certain loads they help. It all has to do with gas exiting the barrel under force or not. I'm being very broad because I don't know first hand. Just read a lot. I don't have the kind of money to try every bullet with every load configuration with and without suppressor.