It is the on the onus of the shooter to ensure you feel the hit, if they hit you once, they should be able to hit you again, in rapid succession, and make you call hit.
I'm not suggesting you shrug a hit, but it's up to the shooter to engage from a range that you feel the hit. Plinking from 300 feet away and expecting me to hear a bb hit while walking through brush is not my fault, and the shooter should know this.
It is a limitation of the sport, you must close the distance so that your weapon can accurately engage and make sufficient contact with the opposing player to make the hit "count" and they feel it.
Ár skal rísa, sá er annars vill
fé eða fjör hafa. Sjaldan liggjandi úlfur
lær um getur né sofandi maður sigur.