Penetration, Part 5

I talked about penetration tables many times before, but there is always something fresh to be discovered. Here is yet another table from Yuri Pasholok. The data in the table contains some obvious typos, which I corrected in my table. Regrettably, all but a handful of these guns are unknown to me, so the names may not be entirely correct.

"Comparative table of penetration of tank armour by anti-tank and battalion guns (composed by artillery engineer Verkfeld)
1932

Gun name	Penetration	Range in meters	Angle of impact
20 mm Oerlikon gun	30	400	90
	36	100	90
	40	closer	90
20 mm Holland Society gun, without muzzle brake	20	200	90
	18	300	90
	15	400	90
with muzzle brake	21	600	90
	32	400	90
	36	200	90
20 mm Madsen gun
With 675 m/s muzzle velocity	25	175	90
With 780 m/s muzzle velocity	Unknown
American 37 mm M-1 gun	25	900	90
37 mm Bofors gun
0.6 kg shell	20	780	90
	10	2400	90
0.8 kg shell	20	980	90
	20	620	60
40 mm Beardmore gun	30	300	90
47 mm Bofors gun	40	920	90
	40	420	60
	30	1650	90
	30	1000	60
	20	3040	90
47 mm Beardmore gun	20	1250	90
	15	1250	60
47 mm Vickers gun	30	300	90
	26	500	90
	22.5	750	90
	20	1000	90
	17	1500	90
TO/32 Skoda gun	22	500	90
	17	1000	90
65/37 mm Holland Society gun	18	600	90
60/44 mm Vickers gun	30	300	90
	20	600	90
	12	1000	90
	22	360	60
	18.5	600	60
	11.4	1000	60
60/44 mm Vickers gun	24	300	45
	15.6	600	45
	10	1000	45
70/47 mm Holland Society gun	20	1000	90
75/47 mm Holland Society gun	40	910	90
	30	1600	90
	22	2900	90

The above table shows that various gun calibers are used in anti-tank roles, from 20 mm to 75 mm. The main caliber of this time is 37 mm, but, as seen in the table, it does not effectively solve the task it is given. [illegible] are gradually receding, and calibers around 45 mm are becoming popular. As can be seen from the table, the 47 mm Bofors gun more or achieves its goals. Its appearance led to a lot of talk in military technical literature. Many of the guns in the above table are automatic, capable of firing not only at ground targets, but air targets, if installed in special mounts."

A particularly notable gun in this list is the Vickers 47 mm. This gun was installed in the Vickers 6-ton Type B (single turret). As you can see, its armour-piercing effect was quite potent, especially considering the thin armour of the tank itself.

The note about anti-tank guns reaching calibers of 75 mm isn't quite true. The guns with slashes in their names are bicaliber. A replacement barrel allows the use of two calibers in the same gun system, with minimal changes. The actual caliber of the fired shell would be the second one, in the cases of the above table, 37-47 mm.