As an example we have the 7.9 mm assault rifle cartridge, of which the approximate production figures as well as the headstamps are known. Looking at it, the rise in production is much, much larger than the rise in observed case lot numbers on headstamps. So over time the lot size must have grown very significantly. Estimated of production based on headstamps would be very misleading.
Erik Windisch in 2000 wrote that in 1944 the lot size for 7.9 mm rifle cases was raised from 1 to 3 million. I have no case lot figures from around 1932, but rifle bullet lot size at that time was only 100 thousand.
From specifications it is known:
The maximum lot size for cups of all types (cases, bullet jackets) was 35 metric tons in 1935.
In 1933 the maximum lot size for completed 9 mm bullets was 240 thousand.
The maximum lot size for 08 SE bullets (undated) was 1 Million.
I am afraid that reliable information about actual lot sizes of PistPatr 08 production will not be found.