Are you sure? I coulda swore then were amped in some kinda way but i guess not. Either way he has led a team and combated countless foes while evading bullets explosives and other crazy crap and im pretty sure he got the upperhand on Red Skull.
Then he combated an army with the Avengers and held his own very well considering his "limitations" and was thrown out of a window and onto a car and was blasted in the stomach and continued fighting.
Beast has been in two fights and in one he defeted several low level "pawns" and in the other he defeted Azazel with help from his teamates. He did display great agility and strength but i dont think Cap would have any trouble in Beasts place while i doubt Beast could do as much as Cap has done