By very low power, I mean it barely penetrates an old Vickers Mk VI tank, or the Stuart, or similar. In my experience, the Panzerbusche 39 in Forgotten Hope 2 is more an anti-car rifle than anything, it seems to have only the penetration needed for halftracks like the Universal carrier and the Sdkfz. 251, and the lightest of the armored cars just barely.
Does it have an after-effect I'm not noticing, or is it just that in real life the Panzerbusche 39 hardly compared to it's Russian and British AT rifle counterparts?