tanks

[McIvan]

Generally speaking, the tanks you mentioned have guns that overmatch the armour of the targets....although Shermans with the normal 75mm will often bounce rounds off Stugs with 80mm curved fronts and T34/76s pretty much won't get through 80mm stug fronts at all and have trouble with 80mm PzIV hull fronts, but not the 50mm turrets.

Shermans actually ended up with some decent armour. Unfortunately the common German tank guns were powerful enough to routinely defeat it.