Here is part of a piece by Wikipedia about the Mad Minute.  The yellow high light is mine.  Apparently this author thinks the Mad Minute was shot by palming the bolt.

Frank

"The Mad Minute was a pre-World War I bolt-action rifle speed shooting exercise used by British Army riflemen, using the Lee–Enfield service rifle. The exercise formally known as "Practice number 22, Rapid Fire, The Musketry Regulations, Part I, 1909", required the rifleman to fire 15 rounds at a "Second Class Figure" target at 300 yd (270 m). The practice was described as; "Lying. Rifle to be loaded and 4 rounds in the magazine before the target appears. Loading to be from the pouch or bandolier by 5 rounds afterwards. One minute allowed". The practice was only one of the exercises from the annual classification shoot which was used to grade a soldier as a marksman, first-class or second-class shot, depending on the scores he had achieved. The rapid aimed fire of the ‘Mad Minute’ was accomplished by using a 'palming' method where the rifleman used the palm of his hand to work the bolt, and not his thumb and forefinger, while maintaining his cheek weld and line of sight.

The "Second Class Figure Target" was 48 inches square (approximately 1.2 x 1.2 meters), with 24 in (61 cm) inner and 36 in (91 cm) magpie circles. The aiming mark was a 12 in × 12 in (30 cm × 30 cm) silhouette figure that represented the outline of the head of a man aiming a rifle from a trench. Points were scored by a hit anywhere on the target."