+2 on inner foam ear pro.
As for active / electronic outer for .50 - especially a Barrett with brake - I'd forget it. The Shockwave messes them around and you don't get true protection
Buy an old fashion, industrial machines hop style outer, and check your cheek weld.
Also, for any spotters, ensure the same thing, the Barrett brake pushes more air around the shooter - shooter gets it easy - and they will suffer more.
I spotted for 180 rounds, M33 660 gn, M82, elevated platform, last Tuesday, double ear pro and still felt like I'd bee ran over by a truck