| 155mm L/40 T7 | |
| Is Ranged: | yes |
| Type: | Tank gun |
| Length: | 6.64m (21.78feet) |
| Part Length: | 6.4276m (21.0879feet) (L/41.4) |
| Origin: | United States |
| Variants: | T7, T7E1 |
| Weight: | 2384kg (5,256lb) |
| Used By: | United States |
| Production Date: | 1940s |
| Caliber: | 155mm |
| Rate: | 2 rpm |
| Velocity: | NaNm/s |
| Max Range: | Project cancelled before maximum range tests occurred |
The 155mm L/40 T7 was an American rifled tank gun developed in 1945. The T7 was to be the main armament for the T30 Heavy Tank, but only a handful were produced due to the T30 project being cancelled after trials in the late 1940s.
The T7 used two-part separated ammunition like the 105mm T5E1 gun on the T29 Heavy Tank. It had a low velocity of only 701m/s compared to the 120mm T53 on the T34 Heavy Tank (945 m/s) and the 105mm T5E1 on the T29 Heavy Tank (945 m/s). However, the 43 kg (95 lbs) High-Explosive shell (HE) and high-velocity armour-piercing (HVAP) was demonstrated to have a powerful demolition effect. Testing concluded before completion when the T30 project was cancelled in the late 1940s.
| Muzzle velocity | Penetration (mm) | ||||||||||
| 500 m | 1000 m | 1500 m | 2000 m | 2500 m | 3000 m | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| M112B1 (AP) | 701m/s | 215 | 213 | 203 | 211 | 195 | 187 | ||||
| T43 (Mod.) (AP) | 774m/s | 254 | 243 | 236 | 226 | 215 | 203 | ||||
| T35 (HVAP) | 1106m/s | 392 | 355 | 340 | 314 | 292 | 276 | ||||
| M107 (HE) | 945m/s | 85 | 85 | 85 | 85 | 85 | 85 | ||||