Outstanding information mark! I'm ashamed to admit I got this idea in my head from saving private Ryan scene where the flamethrower guy got hit and blew up haha. Today those M14type rounds are fairly rare and I'm lucky enough to own a sealed box of them. I do know from reading that flamethrowers had of course a high casualty rate because like you stated, they were slow and terrifying and were usually one of the first targets to be taken out if spotted. I have read where GIs didn't even want to stand nowhere near a flamethrower because of this fact knowing that he was a main target