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45 mm APCR

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"To the Chair of the Committee of Defense, comrade I.V. Stalin

I provide you with the proving grounds results of 45 mm subcaliber armour piercing ammunition designed by Military Engineer 1st Grade Burmistrov.

The best results were obtained with shells using a heavy and hard tungsten alloy core. These shells can achieve the objective of penetrating 60 mm of armour with a coefficient of resistance of at least K=2400 at an angle of 30 degrees from a range of 300-500 meters and effectively improve the power of the 45 mm mod. 1932/37 anti-tank gun.


Shell

Muzzle velocity

Range

Impact angle

Thick-ness

Armour coefficient

Notes

Variant #1

937

500

35

50

2580

All shells penetrated fully.

Variant #2

1016

500

35

50

2580

Penetrations, some hits gave deep dents.

Stock AP

760

500

35

50

2580

Shallow dents.

Variant #1

937

300

34

60

2500

All shells penetrated fully.

Variant #2

1016

300

34

60

2500

Penetrations, some hits gave deep dents.

Stock AP

760

300

34

60

2500

Shallow dents.

Variant #1

937

150

0

90

2300

All shells penetrated fully.

Variant #2

1016

150

0

90

2300

All shells penetrated fully.

Stock AP

760

150

0

90

2300

Shallow dents.


Stock and experimental 45 mm AP shells were also fired at a captured German tank.

Shell

Muzzle velocity

Range

Impact angle

Thick-ness

Armour component

Notes

Variant #1

937

500

10

60

Lower front plate

Complete penetrations. The brake bar behind the armour is destroyed.

Variant #2

1016

500

10

60

Lower front plate

Two complete penetrations, one shell resulted in a deep dent.

Stock

760

500

10

60

Lower front plate

Shallow dent.

15

50

Upper front plate

Shallow dent.

10

30

Turret side

Complete penetration.

The best penetration and effectiveness is achieved by experimental shells of the first variant. Drawbacks of these shells include slightly reduced precision and use of a lot of tungsten in production. Experimental shells of the second variant are less effective than the first type, but have better precision and use half as much tungsten.

Based on the obtained results, I consider it reasonable to put both variants into production and produce 25-30 thousand units of both types in April, and begin mass production in May. Mass production shells should be tested on proving grounds and in battle in order to fully evaluate them.

The decree draft is attached.

Chief of the Red Army GAU, Colonel-General of Artillery, Yakovlev
Military Commissar of the Red Army GAU, Divisonal Commissar Novikov"


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