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Also, it may also have to do with section thickness of the to be hardened nose and thus with the calibre of shell. For smaller sections like 37, 50 and maybe 75mm projectiles, which can tolerate more hardness, it was sensible to use higher alloyed nose pieces. 75mm beeing roughly borderline here, guessing by the fact that later, monobloc Pzgr39 replaced the composite in production and that 76.2mm Pzgr 39 rot and 88mm Pzgr 39 typically was monobloc, as were 105mm and 128mm Pzgr.
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