With APCR (HVAP shot) rounds the US 76mm M1 was effective against the Panther at 900 yards, but not much beyond 1000 yards. APCR rounds were unfortunately only available in very small quantities to the western Allies in the latter half of 1944, being rushed into service for D-Day. The Jerries started using APCR ammo in 1942 and for comparison the Panther's 7.5 cm KwK 42 could penetrate the Sherman's front at ranges beyond 2,500 yards with the standard APCBC-HE ... beyond 3,500 yards with APCR.