Why was the 76mm gun better than the 75mm?

Why was the 76mm gun better than the 75mm?

The primary reason why the 76mm was seen as better was its armor penetrating power. ... When using high-velocity armor-piercing (HVAP) rounds, the 75mm guns were able to penetrate 4 to 4.5 inches of armor at nearly 1,100 yards. The same rounds used in the 76mm gun could penetrate 6 to 7 inches of armor.