Hosenfield- that’s likely that actual rifle rounds were not a major wound causer in WW 2. But a rifle company is not actively engaged in manning crew weapons. They supported them often. If you are alluding to MGs they were not active all the time. You must remember once you open up a weapon like that it becomes the goal of every enemy soldier to kill you.
Often rifle fire was used to supress the enemy fire so part of the squad could use grenades or lastly move an LMG into place. Often times it was simply necessary to use suppressive firepower as we did in Vietnam and that’s where the M-1 outclassed any bolt action arm. We were able to expend massive amounts of rounds due to the fact that we could could get resupplied fast in most instances while Charlie had to wait for the Hanoi express to trot some down from the north.
On D-Day+60 for example, rifle companies moving in platoon and squad strengths inland in France at best had BARs with them since mobility was the key to their survival.
How many people never fired their rifle in combat may coincide with cooks, barbers, motor pool mechanics and whatnot too since all the support personnel were issues arms. Replacement companies, support batallions and mop up platoons moving in after an area is secured might never have a reason to fire for sure. I simply never interviewed or talked to anyone who never used their weapon in combat if they were in a combat zone.
I was in a recon outfit and we saw far less firefights than the average squad in Vietnam and everyone brought their weapon to bear to increase firepower when needed. If anybody woulda been NOT firing his weapon he woulda got is ass fragged!