 APHE shells are more effective against battlefield sandbag, earthwork or log improvised fortifications and domestic buildings than equivalent-calibre impact detonating HE or fragmentation shells.APHE can be regarded as a useful dual-purpose round in many respects.German Rheinmetall-Borsig evaluation tests on a captured 1-K, during 1941, gave a maximum penetration of up to 42 mm of perpendicular rolled homogenous armour plate at 100 metres with APHE and up to 61 mm of perpendicular hardened carbon steel armour plate at 100 metres with APHE.