German 75mm AP Continued

The final graph is dated 12/7/1945 (Fig 49.2) but still has errors as the 75mm/L70 KwK 42 muzzle velocity is incorrect. (Should be 3068 not 3150).  Correcting for that I marked the penetration level for 500, 1000, 1500, and 2000 yards in red.  Then using the ballistic per Spielberger's Panther book graph data I marked in blue the penetration level for 500, 1000, 1500, and 2000 meters.
When the graph is read the penetration is 143mm at 500 yds while the Aberdeen table lists it at 141mm.  These tables

were reproduced in the US and were believed to be from US tests at Aberdeen.   But in fact they were conducted by the British.  Though between 1943 and 1944 it appears the British changed their criteria to be more like the US criteria.   This is seen where 120.5mm of Machine Quality (280 BHN) armor penetration in 1943 became 133.3mm of penetration in 1945.   (120.5/133.3 =  .900375)

Note - The armor may be per the standard US normalized to
115,000 tensile strength (237 BHN). 

Note - The equivalent protection (per scale tests) of 237 to 280 BHN is from 0.9005 to 0.9025 or average ~ 0.9015.

Note - Perforation may be per British March 1944 C.V. 50 criteria of at least 50% chance of 20% or more of the mass passing through target.   This is slightly more generous than the US NBL standard of at least 50% chance of

Fig. 49.2

50% or more mass passing through the target.
Back to the PaK/KwK 40

To the left:
I used my ballistic calculator to create a firing table for the various muzzle velocity shells.  The shaded rows of the 750 column is the actual official German data.   All other columns are calculated numbers.

Fig. 49.3  Firing Table