When SMLE No1 was first intriduced on the 1 July 1903 the British Army still worked on the line up in a row and fire single shots at ordered range principal. The cut off was placed so the Tommy couldn't waste the goverments 1p by blazing away indiscriminatley. The cut off was only opened on order of an officer. Another practice the South African War put to rest. The Mk 5 and 6 .303 round can carry out to about 1200 yards but not with any accuracy so again form line, raise the rear peep site, mounted just to the left at the end of the bolt. Dial the range onto the the front sight and super elevate. Fire on command, and at 1200 yards the beaten zone becomes about 20 foot square. The SMLE No 1 Mk 111 was introduced in 26th January 1907 and remained unchanged till 1914 when minor technical changes were made to adopt the Mk 7 .303 pointed nose bullet. It was not till 1916 that the mag cut off and volley sights were officially dropped being SMLE No 1 Mk111* it stayed in service till 1939 when the SMLE Rifle No 4 Mk1 was introduced.
Mag cutoff was found to have some use, it acted to keep some mud and muck out the magazine when loaded. The magazine is not routinley removed, the rifle is loaded from the top vis a charger. A metal strip holding 5 rounds which fit into pair of grovves at the back of the rciver. Push firmly with thumb and rounds slid down into the mag.