but wasnt the tigerIIs gun a stronger penetration than the 75mm and 88mm? (just a question, i honestly think the panther's gun cannot be outdone due to its weight and punch.)
it has stronger armor than the firefly. the frontal armor of the panther is devastating. 20 seems fine to me because the 75mm can punch through armor out to 2400 easily and still get tanks at further out with some accuracy needed.
No, the 75mm projectile out of the Panther had more kinetic energy (1/2mv^2) than the 88mm out of the Tiger.
Going from memory here, but the Tiger fired something like a 22 lb projectile at around 800 m/s, the Panther fired a 15 lb projectile at around 900 m/s.
Could be completely wrong, but thats the jist of it. I'd have to go digging through books or yon internet to divine it for sure. The 85mm on the T-34-85 fired a slightly smaller projectile than the Tiger, and at slightly less velocity to boot.