After a year or so of PRS, with ear muffs, I can notice that my left ear, the one exposed to the brake has more ringing that the right. I think those of us who have shot thousands of rounds in a year have a different understanding than most.I shot some prs a few years back, enough to burn up about 10k rounds between a 6.5 creed, 260 rem, 223, and 6 dasher. Bunch of it through a brake and always with foam plugs or muffs. Haven’t had any testing done, but I think I lost a little hearing over that time just from the concussion. No problem to get a ringing in the ears after firing 10 braked rounds stuffed into a concrete culvert, or conex box. No matter what earpro.
I don’t play those games any more, but exclusively use my suppressor now. Brakes suck.