PaK 97/38

[sturmovik]

I'm getting mixed messages on the German PaK 97/38 that was made from captured French 75's. About half the sources I can find (including Wikiepdia) indicate that the gun primarily used a HEAT round due to its low velocity and achieved a penetration of 90mm and that the AP round was not used/issues due to excessive recoil. Other sources say that the French and Polish AP rounds were used primarily because the HEAT shell was not developed was not developed until later in the war (or not at all).

Can anyone clarify how the PaK 97/38's were actually employed by the Germans? The HEAT load seems reasonable given that 75mm HEAT shells were appearing in the loads of the short barreled Panzer IVs about that time.