303 round

[scharfschutzen63]

Does anyone know what this is?

[Alan de Enfield]

B IV is Mark IV (Mk4) Incendiary 303 manufactured in 1938 by the Royal laboratories (RL) with the British military ownership mark of the 'crows foot' between the R & the L

Incendiary rounds were produced in different 'marks' (Mks)
Incendiary Buckingham (VII.B), B Mk 1, B Mk 2Z, B Mk 4B Mk 4

Royal Laboratory, Woolwich Arsenal, Kent, UK. Woolwich Arsenal, of which the Royal Laboratory was only a part, is situated in South East London on the River Thames. The Arsenal dates from 1670 and has manufactured many different items of warlike stores for the armed forces. Ammunition was made at Woolwich long before the adoption of the .303 cartridge in 1889. Ammunition production ceased completely at Woolwich in 1957, the last known production of .303 Ammunition there being Mk 7 Ball in 1957. The Woolwich site apart from containing all the supportive facilities for the research, design, development, inspection and testing of Ammunition also included an extensive range complex on the Plumpstead Marshes. In addition there was a filling area not far away in the vicinity of Abbey Wood.

[scharfschutzen63]

The bullet shape is what I was wondering about. I have never seen a bullet with a step in the ogive like that before.

[green]

The stepped bullet was meant to cut a larger cleaner hole in balloon fabric used on hydrogen filled balloons and zeppelins like a semi wad cutter target bullet. It was developed c1920 and remained in use until replaced by so called DeWilde incendiaries c1940.

[MAC702]

I have never seen a bullet with a step in the ogive like that before.

S&B has it in some of their modern ammo as it has the same effect in things other than balloons, too. This stuff here is very accurate in my Venezuelan FN-49.

https://www.sellier-bellot.cz/en/pro...ce/detail/165/