Soldiers in WWII actually had to be RETRAINED from the standard “basic rifle marksmanship” they received in the pre-war Army.
Upon arriving at the battlefield, they found that maneuver was critical and that large volumes of suppressive fire were required. New soldiers were practicing what they were taught in the states, taking their time to aim and place single shots.
While the M-1 garand (M1A is the civvy M-14 nomenclature) only had an eight-round en bloc clip, it was much better than the German bolt-action mausers. Once the American soldiers learned the art of maneuver and the accompanying suppressive fire, the Germans were at an even worse disadvantage.
And, really, it wasn’t a rifle that won the European war.
It was the artillery.
Re:
...really, it wasn’t a rifle that won the European war. It was the artillery... Gadzooks! You mean... 
Obama didn't win World War Duce and awarded the Nobel peace Prize for doing it????
BTW When the Texas National Guard was federalized in 1940 as the 36th Infantry Divison, my dear old Pappy was in the 132nd Field Artillery Battalion out of Kerens, Texas.
Yet he disagreed with Eisenhower who once said the two pieces of equipment that were most influential in winning the war were the jeep and the C-47. Dad said Ike forgot the "Duce and a half" truck, the LST, the M-1 Garand and M114 155 mm howitzer.