"Conclusions on the report on firing the M7 gun on the American M10 SPG
The GBTU Chief and GBTU SPG Directorate instruction #149068 issued on October 18th, 1943, by the GBTU proving grounds (Kubinka railway station, Western railway) conducted trials of the M7 gun installed in the American M10 SPG. According to the trials program, the following characteristics of the gun were to be recorded:
- Size:
- Barrel length (total)
- Rifled section length
- Diameter between opposing grooves and between opposing lands
- Land width
- Chamber size
- Shell and casing size
- Ballistic data:
- Pressure
- Muzzle velocity
- Maximum range
- Precision
The proving grounds did not record the most important ballistic data (muzzle velocity, maximum pressure, maximum range) and dimensions (diameter between grooves or lands, land width, chamber size), as as result of which the tactical-technical data provided in the report does not give characteristics of the gun.
