The humble .22 cartridge had long been used by the British Army. Although far too small and wimpy for any battlefield role, weapons chambered in the cartridge were ideal for training with and the cartridge was so light that it could be used in indoor rifle ranges at army bases across the country at very little expense. The ammunition was packaged in wooden H51 ammo boxes, which held 3000 rounds. Inside each of these H51 boxes were five tins each of 600 rounds:

Six cardboard boxes of 100 rounds each went inside each tin. The outside of this tin is marked in yellow and indicates that it held 600 .22 rimfire cartridges in Mk 2 cartons that had been manufactured by Kynoch on the 13th January 1964:

The underside of the tin has details of the tin itself, indicating that this is a No 668 box:

The .22 ammunition was used with specially converted Lee Enfield training rifles. After the Second World War, the Rifle, No. 7, Rifle, No. 8 and Rifle, No. 9, all .22 rimfire trainers and/or target rifles based on the Lee action, were adopted or in use with Cadet units and target shooters throughout the Commonwealth, the No.8 as of 2017 has been replaced among cadet forces due to obsolescence. For a detailed look at the No8, readers are directed here.