20 MM CALIBRE CARTRIDGES
METRIC DESIGNATION |
RIM DIAMETER |
NATIONALITY |
PROJECTILE |
VELOCITY |
NAME / WEAPONS |
20 x 70 RB |
20.2 |
D |
AP / 130 |
490 |
WW1 Becker, 1930s Oerlikon F |
20 x 70 RB (E) |
21.0 |
D |
? |
670 |
WW1 Ehrhardt |
20 x 72 RB |
19.0 |
CH / J |
HE / 128 |
600 |
1930s Oerlikon FF and SSG, Type 99-1 |
20 x 80 RB |
19.0 |
D |
HE / 92 |
700 |
WW2 Ikaria MG-FF/M |
20 x 82 |
25.2 |
D |
HE / 115 |
710 |
WW2 Mauser MG 151/20, Vektor GA-1 |
20 x 94 |
24.9 |
J |
HEI / 79 |
730 |
WW2 Ho-103 |
20 x 99 R |
25.2 |
SU |
HE / 96 |
790 |
WW2 ShVAK, Berezin, Helenius rifle |
20x100/101 RB |
19.0 |
CH / J |
HE / 128 |
675-750 |
1920s Oerlikon F, FFL, Type 99-2 |
20 x 102 |
29.5 |
USA |
HEI / 102 |
1,030 |
1950s M39, M61, M197 GIAT 20M621 |
20 x 105 B |
25.0 |
CH |
AP / 140 |
730 |
1930s 'Short Solothurn', Lb 204, S18-100 AT rifle |
20 x 105 |
25.0 |
D |
HE / 134 |
750 |
WW2 Rheinmetall-Borsig MG 204 |
20 x 110 RB |
21.9 |
CH |
HE / 122 |
830 |
1930s Oerlikon F, S, SSG-36 AT rifle, Polsten |
20 x 110 |
24.8 |
F / UK / USA |
HE / 130 |
850-880 |
WW2 HS 404, Hispano, AN-M2, HS 804 |
20 x 110 (USN) |
29.5 |
USA |
HE / 110 |
1,010 |
1950s Mk 11, Mk 12 |
20 x 113 (B) |
28.0 |
SF |
HE / 156 |
830 |
1930s Lahti L-34 'boat gun' |
| 20x 115 SR | 29.0 | F | AP / 104 | 850-890 | 1918 Delaunay-Belleville AT MG |
20 x 120 |
28.9 |
DK |
HE / 126 |
840 |
1930s Madsen |
20 x 120 RB |
20.0 |
? |
? |
? |
1930s Simonetta |
| 20 x 122 | 32.3 | F | ? | ? | 1950s 5CG AA |
20 x 125 |
28.5 |
J |
HEI / 127 |
820 |
WW2 Type 97 AT rifle, Ho-1, Ho-3 |
| 20 x 126 | 30.2 | USA | finned | ? | c.1960s Davy Crockett spotter |
| 20 x 126 B | 33.2 | F | ? | ? | 1950s 5CG AA |
20 x 128 |
32.0 |
CH |
HE / 120 |
1,050 |
1950s Oerlikon KAA, Meroka CIWS |
| 20 x 135 | 27.8 | D | ? | ? | WW2 Polte |
20 x 135 |
32.0 |
D |
HE / 112 |
1,050 |
WW2 Mauser MG 213C |
| 20 x 138 RB | 21.1 | D | ? | ? | WW2 project |
20 x 138B |
27.0 |
CH |
HE / 119 |
900 |
1930s 'Long Solothurn', FlaK/KwK 30/38, Solothurn S18-1000/1100 and Lahti AT rifles |
20 x 139 FMK |
28.5 |
CH |
HEI / 131 |
1,010 |
WW2 FMK / Flab Kan 38 (rim 2.6 mm thick) |
20 x 139 |
28.5 |
CH |
HE / 120 |
1,100 |
1950s HS 820, Oe KAD, Rh 202, 20M693, Vektor F2 (rim 3.5 mm thick) |
20 x 142 |
33.4 |
J |
HET / 132 |
950 |
WW2 Army Type 98 AA/AT |
20 x 145 R |
29.5 |
S |
AP / 145 |
815 |
1930s Bofors m/40 AA/AT |
| 20 x 158 | 33.4 | J | ? | ? | 1930s Army Type 94 AA |
| 20 x 158 RB | 30.4 | USA | HE / 104 | 1,150 | 1945+ T5 case for T33 aircraft gun |
20 x 180 R |
47.9 |
S |
AP /108 |
950 |
WW2 Carl Gustav m/42 recoilless AT rifle |