Pre-WW1, the British Army trained every soldier to be able to perform on that level with their SMLE - and to hit the target, too. I had an old-timer show me the technique at Connaught many years ago - he pulled the trigger with his middle finger, manipulating the bolt with thumb and trigger finger, neither of which ever left contact with it. Amazing performance.
The record (still standing a century later) was set by a British sergeant who put 38 rounds into a 12" bull at 300 yards.
The firepower produced was such that the German Army, running into the Brits for the first time at Mons, is supposed to have estimated that they had 28 Vickers guns per battalion. They actually had two.
They were men in those days.
EDIT - Chance to get at the book I was thinking of.
It was Sergeant-Instructor Snoxall shooting in 1914. Further, the target was four-foot in size with a 12" bulls-eye. All rounds were within 'the inner ring', but the size of that ring is unknown. (A different source says the inner ring was 36".) Details from yet another source state the feat was done from the prone, no sling, iron sights only (the latter not surprising at the time).
British Army standards of the day required all infantrymen to be able to hit the same target 15 times a minute and those who could not were generally released from the Army.