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The boat-tailed bullet consists of a cupro-nickel envelope (a), copper
sleeve, also form-ing the nose of the bullet (b), steel core (c) with lead
band (d) pressed around its base into cannelures, a lead base plug (e) and
tracer tube (f), transparent closing disc (g) and brass washer (h), and
split steel support piece (j) in the nose which possibly acts as a forming
anvil. The nose (of the copper sleeve) is filled with three composition,
first in the tip and intimately pressed into the split anvil, a mixture of
aluminum and lead oxide. Next a mixture of magnesium, potassium chlorate
and antimony sulphide, and around the nose of the core, reaching back to the lead band at the base of the
core, a mixture of aluminium, magnesium and lead oxide. The central composition is apparently intended to act as an igniter for the other two
incendiary compositions. The tracer composition gives a bright red trace.
The tip of the bullet is painted white to the joint with the cupro-nickel
envelope.
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