This photo shows the interim Pak 36 (r). That is, it has the shield modification along with the moving of the elevation wheel to the gunners side and a German sight, but it fires the Soviet 350mm case. Either using captured Soviet ammunition, or German designed copies.
Some people claim that the muzzle brake is a sign of the actual reworked bore Pak 36. There are some photos of these guns without shields also.
The US data is interesting in that it gives rifling length, tube length and total length. The L51 usually associated with this gun's description actually works out to the total length (face of breech to end of tube). As far as I am concerned, the length that matters is the rifling length. This is physically where the pressure gets the projectile moving. But it seems that different nationalities have their own standards.
Note the elevation of 72 degrees! This was because the gun had a specification to also be a AA weapon! After the Germans moved the elevation wheel to the gunner's side, this was greatly decreased. Supposedly, the early Soviet prototype for this weapon (F-22) had a specifically designed cartridge case, perhaps like the Soviet 76mm AA gun, but it was reworked to use the standard Soviet 350mm case. They really missed a chance to have a Tiger killer IMO.
The data seems to point to a Tungsten Carbide round for both the 350mm case and also the 'Pak 40' case. Also, it enjoyed a period where these ammunition types were actually supplied.
SPECIFICATIONS
Caliber 76.2 mm (3 ins.)
Weight (complete) 3,619 lb.
Weight (firing position) 3,564 lb.
Length (overall) 22 ft. 6 1/4 ins.
Length of gun 153 ins.
Height (traveling position)
Height (firing position)
Width (overall)
Width of trail spread
Length of rifling 120 ins.
Length of tube 12 ft. 2 ins.
No. of grooves 32 R.H. Polygroove form; Twist-1 in 25 Uniform
Width of grooves 0.196 in. (5 mm)
Depth of grooves 0.033 in. (0.84 mm)
Width of lands 0.078 in. (2 mm)
Muzzle velocity 2,249 f/s (H.E.—2,335 f/s)
Max. range (horizontal) (A.P.-H.E.) 14,000 yds.
Rate of fire
Traverse 60°
Elevation 72°
Depression 4°
Length of recoil (average) H.E.-A.P.H.E.—31.1 ins.
Ammunition H.E.-A.P.H.E.-A.P. 40
Wt. of Projectile H.E.—13.45 lbs.
A.P.H.E.—14.2 lbs.
A.P. 40—9.2 lbs.
