August 8, 2017
It looks like there was no merit to the British data on the dispersion of the KwK 42 shell. Miles Krogfus came through with the actual firing table for the gun. H. Dv. 119/325 link
July 24, 2017
The idea of having a two tier ranging error based on the sight range is a no go. Sight pictures for sights where the text says they only go to 1500m or some small distance shows they are calibrated beyond 2000 and many cases
3000m. The text on the Russian SU-152 sight, ST-10 says it's range is 900m and the ST-18 is up to 1500m. The sight itself reveals that it is calibrated to over 5000m. This is optimistic to say the least. So I guess I'm back to a single standard deviation for a sight. Now this assumes the sight pictures found on World of Tanks or War Thunder are accurate. The text descriptions of the sights on these two telescopic sights say that they have limited range but the periscope sight goes to 5000 meters. Maybe the game makers melded the two sights into one for game play.
July 17, 2017
Page 32 has a picture of the updated menu for the Ballistics program. The range estimation error is now a product of the guns sight of the weapon. The base factor starts off as Field of View times magnification x ratio of calibration range. Then other subjective factors like milli-radian, glass clarity or range and lead marks ease of use. This yielded a single factor. But, I was thinking that it might be two factors. One would be a ranging error up to the limit of its range calibration then thereafter there would be a higher ranging error as the gunner would have to estimate the range even more. This would result in a step in the to hit curve where the first ranging error ends and the second begins and continues.
Then there's the problem that if they have say a range error do they know when they are beyond the range marks of their sights?
This may be over thinking something that is more in the realm of crew quality and not tank attribute.
June 14, 2017
Working on updating Naab naval ballistics program. It is based on an old version of Nathan Okun's facehard basic program. Looks like a lot of detail shell factors have changed. I haven't checked other aspects of the program yet.
May 18, 2017
One question over at the Axis History forum was about the deviation of the 75mm/L70 KwK 42 gun. I had thought it was like the 75mm/L46 KwK 40 gun but more accurate. Looking into this more I found some text I saved from what it seemed to be a British report of the gun at 2187 yds.
German extreme dispersion 2000m
1.75 w x 1.5h 2187yd
75mm/L70 69" / 59"
Using this ratio and solving for German training and action values with dispersion only I found that I could resolve the values.
So this is the result:
1500m___0.563/0.484____ =98.6/72.4_________ >100%/72%