And consistent with a good sniper firing only a few shots a day, to avoid giving away his position, where he had plenty of targets.
Any idiot with a machine gun can do a lot more damage than a sniper, but they’re not firing in the same circumstances.
A sniper in the field (as distinct from an assassin) is typically seeking a few targets each day which will cause maximum disruption to the enemy, whether by removing leaders or discouraging movement or creating fear and uncertainty, and ideally all of the above to hamper the enemy.
A machine gunner is usually only firing in defence or attack.
On a ‘bullet fired per man’ basis, the sniper is a lot, lot more effective in hampering the enemy outside attack and defence, but not much use in attack or defence compared with a machine gunner and often not all that much more use than an average rifleman.