Not for a real "concussion headache." Your head is porous- sinuses, ear canals, mouth and even your eyes. All of these allow the concussive force of explosions that happen around you to interact with your brain, and it is very well established that the results of this are immediate and bad at best. Essentially, every round that goes off near your head is a small traumatic brain injury if you're not using good ear pro that is worn properly. Really the best case scenario is to wear both "over ear" and "in ear" when shooting anything big.
It's not just report, it also involves the shoulder being somewhat connected to the "headbone."
Eileen has always worn very good ear protection, but we were eventually able to pin it down to rifles that recoiled more than about 15 foot-pounds, according to the standard recoil formula. And after she had the muzzle brake installed on the .308 she could definitely tolerate shooting the rifle more before the headache starting to show up, even though brakes are louder.
