I would not normally reply to a thread that is over 4 years old; however for the benefit of future researchers on the subject of the Mad Minute I have included this recently researched information here.
Taken from, Sussex County Rifle Association, 1861~ 1961.
n.b. This is an account of the first 100 years of the association and a record of those who have achieved success for there regiment or county within the association.
Jackson, A.T. Volunteer Medical Staff Corp, Royal Marine Artillery, East Lancashire Regt and Machine Gun Corp. (He certainly got around!)
Qualified "Distinguished" at Hythe School of Musketry Instructors course 1905.
Held the rapid fire record, made at Strensall, Yorkshire, in 1915. Score 107 ex 140 for 35 rounds in one minute at 200 yards with S.M.L.E. Rifle, since equalled on a number of occasions.
I think this might indicate that Jackson was the first to hold the record then beaten by the likes of Walingford & Snoxall in the UK.