Every source I've read says that APRC is out after 1942 due to material shortages, although exceptions are made in 1943 for 50mm Pak gun [and maybe this 37mm BK gun].
Sorry, but then not any of these sources have ever seen any original German ammunition production and storage sheet from the "Chef der Heeresrüstung und Befehlshaber des Ersatzheeres, Stab IIc (Rüst)".
While most Pzgr. 40 types were no longer produced after 1942, the numbers in storage were enough to last till beginning of 1944 and longer.
3.7 cm Pzgr. 40 for the 3.7 cm Kw.K.: 270,000 rounds in storage on December 1943, no production.
5 cm Pzgr. 40 for the 5 cm Kw.K.: 298,000 rounds in storage on December 1943, no production.
5 cm Pzgr. 40 for the 5 cm Kw.K. 39: 32,000 rounds in storage on December 1943, occasional production about equal to usage.
7.5 cm Pzgr. 40 for the 7.5 cm Kw.K. 40: 15,000 rounds in storage on December 1943, production of about 50% of the usage.
3.7 cm Pzgr. 40 for the 3.7 cm Pak: 680,000 rounds in storage on December 1943, no production.
5 cm Pzgr. 40 for the 5 cm Pak 38: 207,000 rounds in storage on December 1943, occasional production.
The start of the production of Pzgr. 40 types can be read in detail in one of my articles:
http://www.beim-zeugmeister.de/zeugmeis ... ?id=40&L=1
I hope to find the time to expand the article to cover the whole production and storage till 1945.