.303" Armour Piercing ammunition:

This was the first approved armour piercing cartridge, introduced in 1915. The bullet had the same shape as the ball mk VII, (pointed) with a cupro nickel envelope. The core had a steel tip and a lead / antimony rear portion. The headstamp includes the mark numeral VII and the codeletter "S".

The ball mk VII.P has a bullet with a cupro nickel envelope. It has a steel core enclosed in a lead sleeve. The headstamp includes de code letter "P" (VII.P)

Same cartridge as above, but with a Nitro cellulose propellant. The headstamp included VII P z.

The bullet of the ball mk VII.F has an envelope made of copper, and a lead core. The headstamp included VII.F. Later cases (from ± 1920) had a green primer annulus.

Same cartridge as above, but with a Nitro cellulose propellant. The headstamp included VII F z.

The ball mk VII.W bullet has a cupro nickel clad steel or gilding metal clad steel envelope. the steel core was enclosed in a lead sleeve. The mark numeral and code letter VII W was included in the headstamp.

Same cartridge as above, but with a nitrocellulose propellant. (instead of Cordite) The headstamp includes the code VII W z.

In 1927 the name was changed in W mk I, without changing the design of the bullet.

Same cartridge as above, but with a nitrocellulose propellant. (instead of Cordite) The headstamp includes the code W I z.