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Along with ball, tracer and armour-piercing, in 1918 Royal Laboratory loaded Buckingham type incendiary ammunition on contract for the United States.
WWI Contract Incendiary.
These were loaded into American supplied cases that could have any contemporary U.S. military headstamp. The bullets were basically copies of the Buckingham Mark III with the flat nose. The envelope was gilding metal and weight was about 150 grains.
Identification , apart from the flat nosed bullet, was by a blue case mouth seal.
Left: RL loaded Buckingham incendiary. The blue case mouth seal is too worn to be seen.
In WW2 Britain imported small quantities of American M1 incendiary, but was generally unhappy with the design of both the .303 inch and .50 inch incendiary bullets.The reason was because of numerous barrel prematures caused by the steel sleeve moving forward and crushing the incendiary composition in the bullet tip. Britain preferred to design her own bullets.
Incendiary B Mark Iz
"Cartridge S.A. .Incendiary 30 inch B Mark Iz" was provisionally approved to design DD/L/14033 in August 1943 but was not shown in Lists of Changes. An order for 10,000 rounds had been placed in November 1942 but this was cancelled and only experimental quantities of this round were made.
The cases were standard American Boxer primed cases.
The bullet was flat based and the design was based on the .303 inch B Mark VII Incendiary. Bullet weight was about 154 grains with 7 grains of SR365 incendiary composition.
Propellant was about 53 grains of nitrocellulose and observed velocity at 78 feet was to be 2,950 fps.
Incendiary B Mark IIz
"Cartridge S.A. .Incendiary 30 inch B Mark IIz" was to design DD/L/12689 but the date is not known. It was not shown in Lists of Changes.
The cases were standard American Boxer primed cases.
The bullet was flat based with a gilding metal envelope and the design was based on the .303 inch B Mark VII Incendiary. Bullet weight was about 154 grains with 7 grains of SR365 incendiary composition.
Propellant was about 50 grains of nitrocellulose and observed velocity at 78 feet was to be 2,850 fps at a mean pressure of 20 tsi.
Like the B Mark Iz, very few appear to have been made and no surviving specimens are known.
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