Cartridge, 40 mm: L/70 HE-T

other fillings have been used, for example cast Tritolital. The base of the projectile contains a tracer element which burns for at least 4 seconds after firing. Bofors fuzes fitted to the nose include the mechanical PD LI 472 for aircraft targets and the deeper intrusion PD LI 473, for lightly armoured ground targets. The latter incorporates an optional 0.3 µs impact delay, allowing the shell to penetrate and detonate inside the target while the PD LI 472 has an impact sensitivity against 2 mm dural at impact velocities as low as 350 m/s. Both fuzes have a delayed arming device, which prevents arming until the projectile is 55 to 60 m from the muzzle, and a mechanical self-destruct time of 12 seconds; there is also a tropical rain safety. One alternative self-destruct point detonating fuze is the DM 321 produced by Junghans Feinwerktechnik. The drawn 70:30 brass cartridge case has a semi-rimmed base and is fitted with a percussion primer with a sinoxide detonator. Propellant loads vary from manufacturer to manufacturer but the Bofors 40 mm L/70 HE-T uses approximately 485 g of a flash-reduced single-base nitrocellulose powder (NC 1066), producing a muzzle velocity of 1,005 m/s. An alternative charge is multiperforated Type M1 propellant which also produces a muzzle velocity of 1,005 m/s. The low-cost training equivalent to the 40 mm L/70 HE-T is the 40 mm L/70 TP or TP-T. This has the same ballistic, weight and dimensional characteristics as the HE-T but lacks any filling or is filled with an inert high-explosive substitute. It is fitted with an inert or dummy PD fuze or a solid nose cap.