Found as a loose drawing at the Leeds Library, marked as;
Cartridge, SA, Incendiary, .303 inch
Drawing No D.D (L) 10224
Dated 3/11/39
Warhead (‘D’ tube) filled with nitroglycerine/wood meal mixture
LA (top) Lead Azide c 5 grains
CC (middle) Incendiary load 4.5 grains CE
IM (bottom) Mixture of Barium Nitrate/Aluminium Powder 50/50 4 grains
Peter