British Tank Guns

Effectiveness of Guns and typical AFV Ammo Loads in British Service
(including some U.S. Types)

A.F.V ARMAMENT, AMMUNITION, AND PERFORATION PERFORMANCE OF AP TYPES AGAINST HOMOGENEOUS ARMOUR.

Weapon	Muzzle Velocity in fps	Ammunition	Perforates (mm at 30º at 1000 yds)	Proportions Carried*
20mm	2725 2725 2725	S.A.P.H.E.I. H.E.I. H.E.I.T. and other types.	- - -	33.3% 33.3% 33.3%
37mm	2900 2900 3100 2700 2450/2500	A.P. M74 (1) A.P.C.B.C. M51 (1) Littlejohn H.E. M63 (2) Cannister M2	- 53.0 (3) 60.0 - -	- 50% - 45% 5%
2pdr	2800 2600 3900	A.P.H.V. A.P.C.B.C. Littlejohn Mk.II	44.2 50.6 79.0	- 100% -
6pdr	2950 2725 4000 2775	A.P.H.V. A.P.C.B.C. A.P.D.S. H.E.	- 74.5 118.0 -	- 100% -
75mm	2030 2030 1980 850 850 950 1515 2030 1814 1135	A.P.C.B.C. M61 A.P.C.B.C./H.E. M61 H.E. M48 Super (5) Smoke B.E. Mk.II Smoke B.E. Mk.V H.E. M48 Reduced H.E. M48 Normal A.P. M72 H.E. Mk.I Normal (7) H.E. Mk.I Normal (8)	63.0 (4) 63.0 - - - - - - - -	35% (4a) 35% (4a) 55% (6) 10% - - - - (9) (9)
76mm	2600 2600 2600 2700 900	A.P. M79 A.P.C.B.C. M62 A.P.C.B.C./H.E. M62 H.E. (10) Smoke M88 B.E.	- - - - -	- 45% - 45% 10%
77mm	2600 3675 1650	A.P.C.B.C. A.P.D.S. H.E.	100.0 149.0 -	44% 6% 50%
17pdr	2900 3950 2950 1800	A.P.C.B.C. A.P.D.S. H.E. Mk.I (11) H.E. Mk.II	120.0 172.0 - -	60% 6% 34% (11) 34%
95mm	1650 1200/1250 1050 500 660	H.E.A.T. (12) H.E.C.F. (14) H.E. H.E. (15) Smoke B.E.	(13) 110.0 120.0 - - -	10% - 57% - 33%
105mm	1200 1550 -	H.E.A.T. M67 H.E. M1(17) Smoke B.E. M84 and numerous other types	(16) 120.0 - -	10% 57% 33%

(1) Primer M23A2.
(2) Double Base Power (Powder?).
(3) Approximate.
(4) Unless Spaced Armour.
(4a) An assorted mix of these two types totalling 35%.
(5) Fused M48 or M54.
(6) Actually 50% Fused M48 and 5% Fused M54.
(7) With M46-47 R.Y.G.
(8) With M46-47 R.Y.G. but reduced.

(9) Training Type.
(10) M42A1 Fuse P.D. M48 & A1
(11) Used in Challenger only.
(12) Blind on Miss.
(13) At 1400 yards.
(14) Explodes on Miss.
(15) Reduced Charge.
(16) At 20º (not 30º).
(17) Fuse P.D. M48 & A1.

This is a 1944 British War Office Document.

This information above was supplied to me by Jim O'Neil (Arizona, USA), the original source is a declassified document available from the R.A.C. Tank Museum. I've added a comment below in the Notes section.

NOTES:
It is important to remember this table is for Homogeneous Armour (and probably only 245 BHN), it is not applicable to Face Hardened (which is what most German A.F.V.s had from 1941 to 1944 excluding the Panther and Tiger II series).

Effectiveness of Guns and typical AFV Ammo Loads in British Service (including some U.S. Types)

Effectiveness of Guns and typical AFV Ammo Loads in British Service
(including some U.S. Types)